diff --git a/.github/README.md b/.github/README.md
index 8e057209..40ad5e39 100644
--- a/.github/README.md
+++ b/.github/README.md
@@ -830,7 +830,7 @@ describe('R.any', () => {
 
 ```typescript
 
-anyPass<T, U extends T[]>(predicates: { [K in keyof U]: (x: T) => x is U[K]
+anyPass<T>(predicates: ((x: T) => boolean)[]): (input: T) => boolean
 ```
 
 It accepts list of `predicates` and returns a function. This function with its `input` will return `true`, if any of `predicates` returns `true` for this `input`.
@@ -855,7 +855,6 @@ const result = fn(input)
 <summary>All TypeScript definitions</summary>
 
 ```typescript
-anyPass<T, U extends T[]>(predicates: { [K in keyof U]: (x: T) => x is U[K]; }): (input: T) => input is U[number];
 anyPass<T>(predicates: ((x: T) => boolean)[]): (input: T) => boolean;
 anyPass<T>(predicates: ((...inputs: T[]) => boolean)[]): (...inputs: T[]) => boolean;
 ```
@@ -984,18 +983,18 @@ describe('anyPass', () => {
     filtered2 // $ExpectType number[]
   })
   it('functions as a type guard', () => {
-    const isString = (x: unknown): x is string => typeof x === 'string';
-    const isNumber = (x: unknown): x is number => typeof x === 'number';
-    const isBoolean = (x: unknown): x is boolean => typeof x === 'boolean';
-    
-    const isStringNumberOrBoolean = anyPass([isString, isNumber, isBoolean]);
+    const isString = (x: unknown): x is string => typeof x === 'string'
+    const isNumber = (x: unknown): x is number => typeof x === 'number'
+    const isBoolean = (x: unknown): x is boolean => typeof x === 'boolean'
+
+    const isStringNumberOrBoolean = anyPass([isString, isNumber, isBoolean])
 
-    isStringNumberOrBoolean // $ExpectType (input: unknown) => input is string | number | boolean
+    isStringNumberOrBoolean // $ExpectType (input: unknown) => boolean
 
-    const aValue: unknown = 1;
+    const aValue: unknown = 1
 
     if (isStringNumberOrBoolean(aValue)) {
-      aValue // $ExpectType string | number | boolean
+      aValue // $ExpectType unknown
     }
   })
 })
@@ -3609,6 +3608,10 @@ describe('R.dropRepeats', () => {
 
 [![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#dropRepeats)
 
+### dropRepeatsBy
+
+[![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#dropRepeatsBy)
+
 ### dropRepeatsWith
 
 <a title="redirect to Rambda Repl site" href="https://rambda.now.sh?const%20list%20%3D%20%5B%7Ba%3A1%2Cb%3A2%7D%2C%20%7Ba%3A1%2Cb%3A3%7D%2C%20%7Ba%3A2%2C%20b%3A4%7D%5D%0Aconst%20result%20%3D%20R.dropRepeatsWith(R.prop('a')%2C%20list)%0A%0A%2F%2F%20%3D%3E%20%5B%7Ba%3A1%2Cb%3A2%7D%2C%20%7Ba%3A2%2C%20b%3A4%7D%5D">Try this <strong>R.dropRepeatsWith</strong> example in Rambda REPL</a>
@@ -3787,6 +3790,10 @@ describe('R.either', () => {
 
 [![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#either)
 
+### empty
+
+[![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#empty)
+
 ### endsWith
 
 ```typescript
@@ -3959,6 +3966,10 @@ describe('R.endsWith - string', () => {
 
 [![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#endsWith)
 
+### eqBy
+
+[![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#eqBy)
+
 ### eqProps
 
 It returns `true` if property `prop` in `obj1` is equal to property `prop` in `obj2` according to `R.equals`.
@@ -5721,36 +5732,46 @@ forEach<T, U>(fn: ObjectIterator<T, void>): (list: Dictionary<T>) => Dictionary<
 import { isArray } from './_internals/isArray.js'
 import { keys } from './_internals/keys.js'
 
-export function forEach(fn, list){
-  if (arguments.length === 1) return _list => forEach(fn, _list)
+export function forEachObjIndexedFn(fn, obj){
+  let index = 0
+  const listKeys = keys(obj)
+  const len = listKeys.length
 
-  if (list === undefined){
-    return
+  while (index < len){
+    const key = listKeys[ index ]
+    fn(
+      obj[ key ], key, obj
+    )
+    index++
   }
 
-  if (isArray(list)){
-    let index = 0
-    const len = list.length
+  return obj
+}
 
-    while (index < len){
-      fn(list[ index ])
-      index++
-    }
-  } else {
+export function forEachObjIndexed(fn, list){
+  if (arguments.length === 1) return _list => forEachObjIndexed(fn, _list)
+
+  if (list === undefined) return
+
+  return forEachObjIndexedFn(fn, list)
+}
+
+export function forEach(fn, iterable){
+  if (arguments.length === 1) return _list => forEach(fn, _list)
+
+  if (iterable === undefined) return
+
+  if (isArray(iterable)){
     let index = 0
-    const listKeys = keys(list)
-    const len = listKeys.length
+    const len = iterable.length
 
     while (index < len){
-      const key = listKeys[ index ]
-      fn(
-        list[ key ], key, list
-      )
+      fn(iterable[ index ])
       index++
     }
-  }
+  } else return forEachObjIndexedFn(fn, iterable)
 
-  return list
+  return iterable
 }
 ```
 
@@ -5881,6 +5902,10 @@ describe('R.forEach with objects', () => {
 
 [![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#forEach)
 
+### forEachObjIndexed
+
+[![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#forEachObjIndexed)
+
 ### fromPairs
 
 It transforms a `listOfPairs` to an object.
@@ -9329,7 +9354,7 @@ mergeWith<Output>(fn: (x: any, z: any) => any): <U, V>(a: U, b: V) => Output;
 ```javascript
 import { curry } from './curry.js'
 
-function mergeWithFn(
+export function mergeWithFn(
   mergeFn, aInput, bInput
 ){
   const a = aInput ?? {}
@@ -9337,21 +9362,15 @@ function mergeWithFn(
   const willReturn = {}
 
   Object.keys(a).forEach(key => {
-    if (b[ key ] === undefined){
-      willReturn[ key ] = a[ key ]
-    } else {
-      willReturn[ key ] = mergeFn(a[ key ], b[ key ])
-    }
+    if (b[ key ] === undefined) willReturn[ key ] = a[ key ]
+    else willReturn[ key ] = mergeFn(a[ key ], b[ key ])
   })
 
   Object.keys(b).forEach(key => {
     if (willReturn[ key ] !== undefined) return
 
-    if (a[ key ] === undefined){
-      willReturn[ key ] = b[ key ]
-    } else {
-      willReturn[ key ] = mergeFn(a[ key ], b[ key ])
-    }
+    if (a[ key ] === undefined) willReturn[ key ] = b[ key ]
+    else willReturn[ key ] = mergeFn(a[ key ], b[ key ])
   })
 
   return willReturn
@@ -9368,10 +9387,10 @@ export const mergeWith = curry(mergeWithFn)
 
 ```javascript
 import { concat } from './concat.js'
-import { mergeWith } from './mergeWith.js'
+import { mergeWithFn } from './mergeWith.js'
 
 test('happy', () => {
-  const result = mergeWith(
+  const result = mergeWithFn(
     concat,
     {
       a      : true,
@@ -9384,8 +9403,8 @@ test('happy', () => {
   )
   const expected = {
     a      : true,
-    values : [ 10, 20, 15, 35 ],
     b      : true,
+    values : [ 10, 20, 15, 35 ],
   }
   expect(result).toEqual(expected)
 })
@@ -9393,31 +9412,31 @@ test('happy', () => {
 // https://github.com/ramda/ramda/pull/3222/files#diff-d925d9188b478d2f1d4b26012c6dddac374f9e9d7a336604d654b9a113bfc857
 describe('acts as if nil values are simply empty objects', () => {
   it('if the first object is nil and the second empty', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, undefined, {}
     )).toEqual({})
   })
 
   it('if the first object is empty and the second nil', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, {}, null
     )).toEqual({})
   })
 
   it('if both objects are nil', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, undefined, null
     )).toEqual({})
   })
 
   it('if the first object is not empty and the second is nil', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, { a : 'a' }, null
     )).toEqual({ a : 'a' })
   })
 
   it('if the first object is nil and the second is not empty', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, undefined, { a : 'a' }
     )).toEqual({ a : 'a' })
   })
@@ -10692,18 +10711,7 @@ test('index lens', () => {
 
 ```typescript
 
-partial<
-  Args extends unknown[],
-  ArgsGiven extends [...Partial<Args>],
-  R
->(
-  fn: (...args: Args) => R,
-  ...args: ArgsGiven
-): Args extends [...{[K in keyof ArgsGiven]: Args[K]}, ...infer ArgsRemaining]
-  ? ArgsRemaining extends []
-    ? R
-    : (...args: ArgsRemaining) => R
-  : never
+partial<V0, V1, T>(fn: (x0: V0, x1: V1) => T, args: [V0]): (x1: V1) => T
 ```
 
 It is very similar to `R.curry`, but you can pass initial arguments when you create the curried function.
@@ -10733,31 +10741,22 @@ finalFn('Bar') // =>  'Hello, Foo Bar!'
 <summary>All TypeScript definitions</summary>
 
 ```typescript
-partial<
-  Args extends unknown[],
-  ArgsGiven extends [...Partial<Args>],
-  R
->(
-  fn: (...args: Args) => R,
-  ...args: ArgsGiven
-): Args extends [...{[K in keyof ArgsGiven]: Args[K]}, ...infer ArgsRemaining]
-  ? ArgsRemaining extends []
-    ? R
-    : (...args: ArgsRemaining) => R
-  : never;
-
-partial<
-  Args extends readonly unknown[],
-  ArgsGiven extends [...Partial<Args>],
-  R
->(
-  fn: (...args: Args) => R,
-  args: ArgsGiven
-): Args extends [...{[K in keyof ArgsGiven]: Args[K]}, ...infer ArgsRemaining]
-  ? ArgsRemaining extends []
-    ? R
-    : (...args: ArgsRemaining) => R
-  : never;
+partial<V0, V1, T>(fn: (x0: V0, x1: V1) => T, args: [V0]): (x1: V1) => T;
+partial<V0, V1, V2, T>(fn: (x0: V0, x1: V1, x2: V2) => T, args: [V0, V1]): (x2: V2) => T;
+partial<V0, V1, V2, T>(fn: (x0: V0, x1: V1, x2: V2) => T, args: [V0]): (x1: V1, x2: V2) => T;
+partial<V0, V1, V2, V3, T>(
+  fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T,
+  args: [V0, V1, V2],
+): (x2: V3) => T;
+partial<V0, V1, V2, V3, T>(
+  fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T,
+  args: [V0, V1],
+): (x2: V2, x3: V3) => T;
+partial<V0, V1, V2, V3, T>(
+  fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T,
+  args: [V0],
+): (x1: V1, x2: V2, x3: V3) => T;
+partial<T>(fn: (...a: any[]) => T, args: any[]): (...a: any[]) => T;
 ```
 
 </details>
@@ -10874,44 +10873,20 @@ describe('R.partial', () => {
       aBoolean: boolean,
       aNull: null
     ) {
-      return { aString, aNumber, aBoolean, aNull }
+      return {aString, aNumber, aBoolean, aNull}
     }
 
     // @ts-expect-error
-    partial(fn, 1);
-
-    const fn1 = partial(fn, 'a')
-
-    // @ts-expect-error
-    partial(fn1, 'b');
-
-    const fn2 = partial(fn1, 2)
-    const result = fn2(true, null)
-    result // $ExpectType { aString: string; aNumber: number; aBoolean: boolean; aNull: null; }
-  })
-
-  it('ramda', () => {
-    function fn(
-      aString: string,
-      aNumber: number,
-      aBoolean: boolean,
-      aNull: null
-    ) {
-      return { aString, aNumber, aBoolean, aNull }
-    }
-
-    // @ts-expect-error
-    partial(fn, 1);
+    partial(fn, 1)
 
     const fn1 = partial(fn, ['a'])
-
-    // @ts-expect-error
-    partial(fn1, ['b']);
+    partial(fn1, ['b'])
 
     const fn2 = partial(fn1, [2])
     const result = fn2(true, null)
     result // $ExpectType { aString: string; aNumber: number; aBoolean: boolean; aNull: null; }
-  })})
+  })
+})
 ```
 
 </details>
@@ -18738,6 +18713,20 @@ describe('R.zipWith', () => {
 
 ## ❯ CHANGELOG
 
+8.5.0
+
+- Revert changes in `R.anyPass` introduced in `8.4.0` release. The reason is that the change was breaking the library older than `5.2.0` TypeScript.
+
+- Wrong `R.partial` TS definition  - [Issue #705](https://github.com/selfrefactor/rambda/issues/705)
+
+- Add `R.dropRepeatsBy`
+
+- Add `R.empty`
+
+- Add `R.eqBy`
+
+- Add `R.forEachObjIndexed`
+
 8.4.0
 
 - Add `R.dissocPath`
diff --git a/CHANGELOG.md b/CHANGELOG.md
index c7b5d6d6..92843bb8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,17 @@
+8.5.0
+
+- Revert changes in `R.anyPass` introduced in `8.4.0` release. The reason is that the change was breaking the library older than `5.2.0` TypeScript.
+
+- Wrong `R.partial` TS definition  - [Issue #705](https://github.com/selfrefactor/rambda/issues/705)
+
+- Add `R.dropRepeatsBy`
+
+- Add `R.empty`
+
+- Add `R.eqBy`
+
+- Add `R.forEachObjIndexed`
+
 8.4.0
 
 - Add `R.dissocPath`
diff --git a/NEXT_VERSION_CHECKLIST.md b/NEXT_VERSION_CHECKLIST.md
index fe0f7ea8..5f749ece 100644
--- a/NEXT_VERSION_CHECKLIST.md
+++ b/NEXT_VERSION_CHECKLIST.md
@@ -1,3 +1,16 @@
+fix partial
+
+- dropRepeatsBy
+- empty
+- eqBy
+- forEachObjIndexed
+
+forEachObjIndexed should not contain source file nor test file
+---
+
+
+
+
 in js project like niketa theme, go to source lead to readable code, is ramda the same?
 
 fix https://github.com/selfrefactor/rambdax/issues/93
@@ -10,6 +23,8 @@ automate deno release
 
 deno is advantage as Ramda last release is 3 years ago
 ---
+no testing curry when method is exporting curried function
+---
 group TS test for similar methods
 
 eventual create additional topic in methods - related methods, so it is easy to find tests as the first one alpabetically is the one containing all TS tests
@@ -17,10 +32,6 @@ eventual create additional topic in methods - related methods, so it is easy to
 - construct - it is class helper and classes are not very functional oriented
 - constructN
 
-- dropRepeatsBy
-- empty
-- eqBy
-- forEachObjIndexed
 - gt
 - gte
 - hasIn
@@ -108,4 +119,8 @@ check again deno as dissocpath doesn't add js extension to imports
 ---
 try omitPath as method instead of multiple paths
 ---
-replace missing ramda methods with text that argument is missing
\ No newline at end of file
+replace missing ramda methods with text that argument is missing
+===
+publish after march 2024
+
+export function anyPass<T, U extends T[]>(predicates: { [K in keyof U]: (x: T) => x is U[K]; }): (input: T) => input is U[number];
\ No newline at end of file
diff --git a/README.md b/README.md
index 6f1a90c6..59c81b8b 100644
--- a/README.md
+++ b/README.md
@@ -789,7 +789,7 @@ describe('R.any', () => {
 
 ```typescript
 
-anyPass<T, U extends T[]>(predicates: { [K in keyof U]: (x: T) => x is U[K]
+anyPass<T>(predicates: ((x: T) => boolean)[]): (input: T) => boolean
 ```
 
 It accepts list of `predicates` and returns a function. This function with its `input` will return `true`, if any of `predicates` returns `true` for this `input`.
@@ -801,7 +801,6 @@ It accepts list of `predicates` and returns a function. This function with its `
 <summary>All TypeScript definitions</summary>
 
 ```typescript
-anyPass<T, U extends T[]>(predicates: { [K in keyof U]: (x: T) => x is U[K]; }): (input: T) => input is U[number];
 anyPass<T>(predicates: ((x: T) => boolean)[]): (input: T) => boolean;
 anyPass<T>(predicates: ((...inputs: T[]) => boolean)[]): (...inputs: T[]) => boolean;
 ```
@@ -930,18 +929,18 @@ describe('anyPass', () => {
     filtered2 // $ExpectType number[]
   })
   it('functions as a type guard', () => {
-    const isString = (x: unknown): x is string => typeof x === 'string';
-    const isNumber = (x: unknown): x is number => typeof x === 'number';
-    const isBoolean = (x: unknown): x is boolean => typeof x === 'boolean';
-    
-    const isStringNumberOrBoolean = anyPass([isString, isNumber, isBoolean]);
+    const isString = (x: unknown): x is string => typeof x === 'string'
+    const isNumber = (x: unknown): x is number => typeof x === 'number'
+    const isBoolean = (x: unknown): x is boolean => typeof x === 'boolean'
+
+    const isStringNumberOrBoolean = anyPass([isString, isNumber, isBoolean])
 
-    isStringNumberOrBoolean // $ExpectType (input: unknown) => input is string | number | boolean
+    isStringNumberOrBoolean // $ExpectType (input: unknown) => boolean
 
-    const aValue: unknown = 1;
+    const aValue: unknown = 1
 
     if (isStringNumberOrBoolean(aValue)) {
-      aValue // $ExpectType string | number | boolean
+      aValue // $ExpectType unknown
     }
   })
 })
@@ -3438,6 +3437,10 @@ describe('R.dropRepeats', () => {
 
 [![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#dropRepeats)
 
+### dropRepeatsBy
+
+[![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#dropRepeatsBy)
+
 ### dropRepeatsWith
 
 <a title="redirect to Rambda Repl site" href="https://rambda.now.sh?const%20list%20%3D%20%5B%7Ba%3A1%2Cb%3A2%7D%2C%20%7Ba%3A1%2Cb%3A3%7D%2C%20%7Ba%3A2%2C%20b%3A4%7D%5D%0Aconst%20result%20%3D%20R.dropRepeatsWith(R.prop('a')%2C%20list)%0A%0A%2F%2F%20%3D%3E%20%5B%7Ba%3A1%2Cb%3A2%7D%2C%20%7Ba%3A2%2C%20b%3A4%7D%5D">Try this <strong>R.dropRepeatsWith</strong> example in Rambda REPL</a>
@@ -3603,6 +3606,10 @@ describe('R.either', () => {
 
 [![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#either)
 
+### empty
+
+[![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#empty)
+
 ### endsWith
 
 ```typescript
@@ -3764,6 +3771,10 @@ describe('R.endsWith - string', () => {
 
 [![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#endsWith)
 
+### eqBy
+
+[![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#eqBy)
+
 ### eqProps
 
 It returns `true` if property `prop` in `obj1` is equal to property `prop` in `obj2` according to `R.equals`.
@@ -5422,36 +5433,46 @@ forEach<T, U>(fn: ObjectIterator<T, void>): (list: Dictionary<T>) => Dictionary<
 import { isArray } from './_internals/isArray.js'
 import { keys } from './_internals/keys.js'
 
-export function forEach(fn, list){
-  if (arguments.length === 1) return _list => forEach(fn, _list)
+export function forEachObjIndexedFn(fn, obj){
+  let index = 0
+  const listKeys = keys(obj)
+  const len = listKeys.length
 
-  if (list === undefined){
-    return
+  while (index < len){
+    const key = listKeys[ index ]
+    fn(
+      obj[ key ], key, obj
+    )
+    index++
   }
 
-  if (isArray(list)){
-    let index = 0
-    const len = list.length
+  return obj
+}
 
-    while (index < len){
-      fn(list[ index ])
-      index++
-    }
-  } else {
+export function forEachObjIndexed(fn, list){
+  if (arguments.length === 1) return _list => forEachObjIndexed(fn, _list)
+
+  if (list === undefined) return
+
+  return forEachObjIndexedFn(fn, list)
+}
+
+export function forEach(fn, iterable){
+  if (arguments.length === 1) return _list => forEach(fn, _list)
+
+  if (iterable === undefined) return
+
+  if (isArray(iterable)){
     let index = 0
-    const listKeys = keys(list)
-    const len = listKeys.length
+    const len = iterable.length
 
     while (index < len){
-      const key = listKeys[ index ]
-      fn(
-        list[ key ], key, list
-      )
+      fn(iterable[ index ])
       index++
     }
-  }
+  } else return forEachObjIndexedFn(fn, iterable)
 
-  return list
+  return iterable
 }
 ```
 
@@ -5582,6 +5603,10 @@ describe('R.forEach with objects', () => {
 
 [![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#forEach)
 
+### forEachObjIndexed
+
+[![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#forEachObjIndexed)
+
 ### fromPairs
 
 It transforms a `listOfPairs` to an object.
@@ -8780,7 +8805,7 @@ mergeWith<Output>(fn: (x: any, z: any) => any): <U, V>(a: U, b: V) => Output;
 ```javascript
 import { curry } from './curry.js'
 
-function mergeWithFn(
+export function mergeWithFn(
   mergeFn, aInput, bInput
 ){
   const a = aInput ?? {}
@@ -8788,21 +8813,15 @@ function mergeWithFn(
   const willReturn = {}
 
   Object.keys(a).forEach(key => {
-    if (b[ key ] === undefined){
-      willReturn[ key ] = a[ key ]
-    } else {
-      willReturn[ key ] = mergeFn(a[ key ], b[ key ])
-    }
+    if (b[ key ] === undefined) willReturn[ key ] = a[ key ]
+    else willReturn[ key ] = mergeFn(a[ key ], b[ key ])
   })
 
   Object.keys(b).forEach(key => {
     if (willReturn[ key ] !== undefined) return
 
-    if (a[ key ] === undefined){
-      willReturn[ key ] = b[ key ]
-    } else {
-      willReturn[ key ] = mergeFn(a[ key ], b[ key ])
-    }
+    if (a[ key ] === undefined) willReturn[ key ] = b[ key ]
+    else willReturn[ key ] = mergeFn(a[ key ], b[ key ])
   })
 
   return willReturn
@@ -8819,10 +8838,10 @@ export const mergeWith = curry(mergeWithFn)
 
 ```javascript
 import { concat } from './concat.js'
-import { mergeWith } from './mergeWith.js'
+import { mergeWithFn } from './mergeWith.js'
 
 test('happy', () => {
-  const result = mergeWith(
+  const result = mergeWithFn(
     concat,
     {
       a      : true,
@@ -8835,8 +8854,8 @@ test('happy', () => {
   )
   const expected = {
     a      : true,
-    values : [ 10, 20, 15, 35 ],
     b      : true,
+    values : [ 10, 20, 15, 35 ],
   }
   expect(result).toEqual(expected)
 })
@@ -8844,31 +8863,31 @@ test('happy', () => {
 // https://github.com/ramda/ramda/pull/3222/files#diff-d925d9188b478d2f1d4b26012c6dddac374f9e9d7a336604d654b9a113bfc857
 describe('acts as if nil values are simply empty objects', () => {
   it('if the first object is nil and the second empty', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, undefined, {}
     )).toEqual({})
   })
 
   it('if the first object is empty and the second nil', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, {}, null
     )).toEqual({})
   })
 
   it('if both objects are nil', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, undefined, null
     )).toEqual({})
   })
 
   it('if the first object is not empty and the second is nil', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, { a : 'a' }, null
     )).toEqual({ a : 'a' })
   })
 
   it('if the first object is nil and the second is not empty', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, undefined, { a : 'a' }
     )).toEqual({ a : 'a' })
   })
@@ -10073,18 +10092,7 @@ test('index lens', () => {
 
 ```typescript
 
-partial<
-  Args extends unknown[],
-  ArgsGiven extends [...Partial<Args>],
-  R
->(
-  fn: (...args: Args) => R,
-  ...args: ArgsGiven
-): Args extends [...{[K in keyof ArgsGiven]: Args[K]}, ...infer ArgsRemaining]
-  ? ArgsRemaining extends []
-    ? R
-    : (...args: ArgsRemaining) => R
-  : never
+partial<V0, V1, T>(fn: (x0: V0, x1: V1) => T, args: [V0]): (x1: V1) => T
 ```
 
 It is very similar to `R.curry`, but you can pass initial arguments when you create the curried function.
@@ -10099,31 +10107,22 @@ The name comes from the fact that you partially inject the inputs.
 <summary>All TypeScript definitions</summary>
 
 ```typescript
-partial<
-  Args extends unknown[],
-  ArgsGiven extends [...Partial<Args>],
-  R
->(
-  fn: (...args: Args) => R,
-  ...args: ArgsGiven
-): Args extends [...{[K in keyof ArgsGiven]: Args[K]}, ...infer ArgsRemaining]
-  ? ArgsRemaining extends []
-    ? R
-    : (...args: ArgsRemaining) => R
-  : never;
-
-partial<
-  Args extends readonly unknown[],
-  ArgsGiven extends [...Partial<Args>],
-  R
->(
-  fn: (...args: Args) => R,
-  args: ArgsGiven
-): Args extends [...{[K in keyof ArgsGiven]: Args[K]}, ...infer ArgsRemaining]
-  ? ArgsRemaining extends []
-    ? R
-    : (...args: ArgsRemaining) => R
-  : never;
+partial<V0, V1, T>(fn: (x0: V0, x1: V1) => T, args: [V0]): (x1: V1) => T;
+partial<V0, V1, V2, T>(fn: (x0: V0, x1: V1, x2: V2) => T, args: [V0, V1]): (x2: V2) => T;
+partial<V0, V1, V2, T>(fn: (x0: V0, x1: V1, x2: V2) => T, args: [V0]): (x1: V1, x2: V2) => T;
+partial<V0, V1, V2, V3, T>(
+  fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T,
+  args: [V0, V1, V2],
+): (x2: V3) => T;
+partial<V0, V1, V2, V3, T>(
+  fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T,
+  args: [V0, V1],
+): (x2: V2, x3: V3) => T;
+partial<V0, V1, V2, V3, T>(
+  fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T,
+  args: [V0],
+): (x1: V1, x2: V2, x3: V3) => T;
+partial<T>(fn: (...a: any[]) => T, args: any[]): (...a: any[]) => T;
 ```
 
 </details>
@@ -10240,44 +10239,20 @@ describe('R.partial', () => {
       aBoolean: boolean,
       aNull: null
     ) {
-      return { aString, aNumber, aBoolean, aNull }
+      return {aString, aNumber, aBoolean, aNull}
     }
 
     // @ts-expect-error
-    partial(fn, 1);
-
-    const fn1 = partial(fn, 'a')
-
-    // @ts-expect-error
-    partial(fn1, 'b');
-
-    const fn2 = partial(fn1, 2)
-    const result = fn2(true, null)
-    result // $ExpectType { aString: string; aNumber: number; aBoolean: boolean; aNull: null; }
-  })
-
-  it('ramda', () => {
-    function fn(
-      aString: string,
-      aNumber: number,
-      aBoolean: boolean,
-      aNull: null
-    ) {
-      return { aString, aNumber, aBoolean, aNull }
-    }
-
-    // @ts-expect-error
-    partial(fn, 1);
+    partial(fn, 1)
 
     const fn1 = partial(fn, ['a'])
-
-    // @ts-expect-error
-    partial(fn1, ['b']);
+    partial(fn1, ['b'])
 
     const fn2 = partial(fn1, [2])
     const result = fn2(true, null)
     result // $ExpectType { aString: string; aNumber: number; aBoolean: boolean; aNull: null; }
-  })})
+  })
+})
 ```
 
 </details>
@@ -17452,6 +17427,20 @@ describe('R.zipWith', () => {
 
 ## ❯ CHANGELOG
 
+8.5.0
+
+- Revert changes in `R.anyPass` introduced in `8.4.0` release. The reason is that the change was breaking the library older than `5.2.0` TypeScript.
+
+- Wrong `R.partial` TS definition  - [Issue #705](https://github.com/selfrefactor/rambda/issues/705)
+
+- Add `R.dropRepeatsBy`
+
+- Add `R.empty`
+
+- Add `R.eqBy`
+
+- Add `R.forEachObjIndexed`
+
 8.4.0
 
 - Add `R.dissocPath`
diff --git a/dist/rambda.js b/dist/rambda.js
index b282aca9..c8da1d74 100644
--- a/dist/rambda.js
+++ b/dist/rambda.js
@@ -1015,6 +1015,21 @@ function dropRepeats(list) {
   return toReturn;
 }
 
+function dropRepeatsBy(fn, list) {
+  if (arguments.length === 1) return _list => dropRepeatsBy(fn, _list);
+  let lastEvaluated = null;
+  return list.slice().filter(item => {
+    if (lastEvaluated === null) {
+      lastEvaluated = fn(item);
+      return true;
+    }
+    const evaluatedResult = fn(item);
+    if (equals(lastEvaluated, evaluatedResult)) return false;
+    lastEvaluated = evaluatedResult;
+    return true;
+  });
+}
+
 function dropRepeatsWith(predicate, list) {
   if (arguments.length === 1) {
     return _iterable => dropRepeatsWith(predicate, _iterable);
@@ -1066,6 +1081,19 @@ function either(firstPredicate, secondPredicate) {
   return (...input) => Boolean(firstPredicate(...input) || secondPredicate(...input));
 }
 
+function empty(list) {
+  if (typeof list === 'string') return '';
+  if (Array.isArray(list)) {
+    const {
+      name
+    } = list.constructor;
+    if (name === 'Uint8Array') return Uint8Array.from('');
+    if (name === 'Float32Array') return new Float32Array([]);
+    return [];
+  }
+  if (type(list) === 'Object') return {};
+}
+
 function endsWith(target, iterable) {
   if (arguments.length === 1) return _iterable => endsWith(target, _iterable);
   if (typeof iterable === 'string') {
@@ -1083,6 +1111,11 @@ function endsWith(target, iterable) {
   return filtered.length === target.length;
 }
 
+function eqByFn(fn, a, b) {
+  return equals(fn(a), fn(b));
+}
+const eqBy = curry(eqByFn);
+
 function prop(propToFind, obj) {
   if (arguments.length === 1) return _obj => prop(propToFind, _obj);
   if (!obj) return undefined;
@@ -1246,29 +1279,34 @@ function flip(fn) {
   return flipFn(fn);
 }
 
-function forEach(fn, list) {
-  if (arguments.length === 1) return _list => forEach(fn, _list);
-  if (list === undefined) {
-    return;
+function forEachObjIndexedFn(fn, obj) {
+  let index = 0;
+  const listKeys = keys$1(obj);
+  const len = listKeys.length;
+  while (index < len) {
+    const key = listKeys[index];
+    fn(obj[key], key, obj);
+    index++;
   }
-  if (isArray(list)) {
-    let index = 0;
-    const len = list.length;
-    while (index < len) {
-      fn(list[index]);
-      index++;
-    }
-  } else {
+  return obj;
+}
+function forEachObjIndexed(fn, list) {
+  if (arguments.length === 1) return _list => forEachObjIndexed(fn, _list);
+  if (list === undefined) return;
+  return forEachObjIndexedFn(fn, list);
+}
+function forEach(fn, iterable) {
+  if (arguments.length === 1) return _list => forEach(fn, _list);
+  if (iterable === undefined) return;
+  if (isArray(iterable)) {
     let index = 0;
-    const listKeys = keys$1(list);
-    const len = listKeys.length;
+    const len = iterable.length;
     while (index < len) {
-      const key = listKeys[index];
-      fn(list[key], key, list);
+      fn(iterable[index]);
       index++;
     }
-  }
-  return list;
+  } else return forEachObjIndexedFn(fn, iterable);
+  return iterable;
 }
 
 function fromPairs(listOfPairs) {
@@ -1592,19 +1630,11 @@ function mergeWithFn(mergeFn, aInput, bInput) {
   const b = bInput !== null && bInput !== void 0 ? bInput : {};
   const willReturn = {};
   Object.keys(a).forEach(key => {
-    if (b[key] === undefined) {
-      willReturn[key] = a[key];
-    } else {
-      willReturn[key] = mergeFn(a[key], b[key]);
-    }
+    if (b[key] === undefined) willReturn[key] = a[key];else willReturn[key] = mergeFn(a[key], b[key]);
   });
   Object.keys(b).forEach(key => {
     if (willReturn[key] !== undefined) return;
-    if (a[key] === undefined) {
-      willReturn[key] = b[key];
-    } else {
-      willReturn[key] = mergeFn(a[key], b[key]);
-    }
+    if (a[key] === undefined) willReturn[key] = b[key];else willReturn[key] = mergeFn(a[key], b[key]);
   });
   return willReturn;
 }
@@ -2381,10 +2411,14 @@ exports.drop = drop;
 exports.dropLast = dropLast;
 exports.dropLastWhile = dropLastWhile;
 exports.dropRepeats = dropRepeats;
+exports.dropRepeatsBy = dropRepeatsBy;
 exports.dropRepeatsWith = dropRepeatsWith;
 exports.dropWhile = dropWhile;
 exports.either = either;
+exports.empty = empty;
 exports.endsWith = endsWith;
+exports.eqBy = eqBy;
+exports.eqByFn = eqByFn;
 exports.eqProps = eqProps;
 exports.equals = equals;
 exports.evolve = evolve;
@@ -2400,6 +2434,8 @@ exports.findLastIndex = findLastIndex;
 exports.flatten = flatten;
 exports.flip = flip;
 exports.forEach = forEach;
+exports.forEachObjIndexed = forEachObjIndexed;
+exports.forEachObjIndexedFn = forEachObjIndexedFn;
 exports.fromPairs = fromPairs;
 exports.groupBy = groupBy;
 exports.groupWith = groupWith;
@@ -2446,6 +2482,7 @@ exports.mergeDeepRight = mergeDeepRight;
 exports.mergeLeft = mergeLeft;
 exports.mergeRight = mergeRight;
 exports.mergeWith = mergeWith;
+exports.mergeWithFn = mergeWithFn;
 exports.min = min;
 exports.minBy = minBy;
 exports.minByFn = minByFn;
diff --git a/dist/rambda.umd.js b/dist/rambda.umd.js
index 84f673d6..22e4c025 100644
--- a/dist/rambda.umd.js
+++ b/dist/rambda.umd.js
@@ -1 +1 @@
-!function(n,r){"object"==typeof exports&&"undefined"!=typeof module?r(exports):"function"==typeof define&&define.amd?define(["exports"],r):r((n="undefined"!=typeof globalThis?globalThis:n||self).R={})}(this,function(n){"use strict";function a(n,l){switch(n){case 0:return function(){return l.apply(this,arguments)};case 1:return function(n){return l.apply(this,arguments)};case 2:return function(n,r){return l.apply(this,arguments)};case 3:return function(n,r,t){return l.apply(this,arguments)};case 4:return function(n,r,t,e){return l.apply(this,arguments)};case 5:return function(n,r,t,e,u){return l.apply(this,arguments)};case 6:return function(n,r,t,e,u,i){return l.apply(this,arguments)};case 7:return function(n,r,t,e,u,i,o){return l.apply(this,arguments)};case 8:return function(n,r,t,e,u,i,o,f){return l.apply(this,arguments)};case 9:return function(n,r,t,e,u,i,o,f,c){return l.apply(this,arguments)};default:return function(n,r,t,e,u,i,o,f,c,a){return l.apply(this,arguments)}}}function t(r,n){if(1===arguments.length)return function(n){return t(r,n)};if(10<r)throw Error("First argument to _arity must be a non-negative integer no greater than ten");return a(r,function i(o,f,c){return function(){for(var n=0,r=0,t=f.length,e=arguments.length,u=Array(t+e);n<t;)u[n]=f[n],n++;for(;r<e;)u[t+r]=arguments[r],r++;return u.length<o?a(o-u.length,i(o,u,c)):c.apply(this,u)}}(r,[],n))}function B(u){var i=1<arguments.length&&void 0!==arguments[1]?arguments[1]:function(){return 0},o=2<arguments.length&&void 0!==arguments[2]?arguments[2]:function(n){return n+1};return t(u.length,function(){var r=arguments[0],t=arguments[arguments.length-1],e=i(t.length),n=Array.prototype.slice.call(arguments,0);return n[0]=function(){var n=r.apply(this,function(n,r){for(var t=(n=n||[]).length,e=(r=r||[]).length,u=[],i=0;i<t;)u[u.length]=n[i],i+=1;for(i=0;i<e;)u[u.length]=r[i],i+=1;return u}(arguments,[e,t]));return e=o(e),n},u.apply(this,n)})}function l(n){return Array.prototype.slice.call(n)}function 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n=arguments.length,r=Array(n),t=0;t<n;t++)r[t]=arguments[t];try{return e.apply(void 0,r)}catch(n){return i?u.apply(void 0,[n].concat(r)):u}};throw Error("R.tryCatch | fn '".concat(e,"'"))},n.type=N,n.unapply=function(e){return function(){for(var n=arguments.length,r=Array(n),t=0;t<n;t++)r[t]=arguments[t];return e.call(this,r)}},n.union=function r(t,n){var e;return 1===arguments.length?function(n){return r(t,n)}:(e=l(t),n.forEach(function(n){S(n,t)||e.push(n)}),e)},n.uniq=yn,n.uniqBy=function r(t,n){var e;return 1===arguments.length?function(n){return r(t,n)}:(e=new vn,n.filter(function(n){return e.checkUniqueness(t(n))}))},n.uniqWith=function r(t,n){if(1===arguments.length)return function(n){return r(t,n)};for(var e=-1,u=[];++e<n.length;){var i=n[e];!function(n,r,t){for(var e=!1,u=-1;++u<t.length&&!e;)n(r,t[u])&&(e=!0);return e}(t,i,u)&&u.push(i)}return u},n.unless=function r(t,e){return 1===arguments.length?function(n){return r(t,n)}:function(n){return t(n)?n:e(n)}},n.unnest=function(n){return n.reduce(function(n,r){return[].concat(s(n),Array.isArray(r)?s(r):[r])},[])},n.unwind=function r(t,e){return 1===arguments.length?function(n){return r(t,n)}:p(e[t])?w(function(n){return o(o({},e),{},f({},t,n))},e[t]):[e]},n.update=An,n.updateFn=wn,n.values=function(n){return"Object"!==N(n)?[]:Object.values(n)},n.view=function r(t,n){return 1===arguments.length?function(n){return r(t,n)}:t(vr)(n).x},n.when=yr,n.where=function r(t,n){if(void 0===n)return function(n){return r(t,n)};var e,u,i=!0;for(e in t)i&&(u=t[e](n[e]),i)&&!1===u&&(i=!1);return i},n.whereAny=function r(t,n){if(void 0===n)return function(n){return r(t,n)};for(var e in t)if(t[e](n[e]))return!0;return!1},n.whereEq=function r(t,e){var n;return 1===arguments.length?function(n){return r(t,n)}:(n=I(function(n,r){return k(n,e[r])},t),Object.keys(n).length===Object.keys(t).length)},n.without=function r(t,n){return void 0===n?function(n){return r(t,n)}:j(function(n,r){return-1<P(r,t)?n:n.concat(r)},[],n)},n.xor=function r(t,n){return 1===arguments.length?function(n){return r(t,n)}:!!t&&!n||!!n&&!t},n.zip=function r(t,n){if(1===arguments.length)return function(n){return r(t,n)};for(var e=[],u=Math.min(t.length,n.length),i=0;i<u;i++)e[i]=[t[i],n[i]];return e},n.zipObj=function r(t,e){return 1===arguments.length?function(n){return r(t,n)}:B(e.length,t).reduce(function(n,r,t){return n[r]=e[t],n},{})},n.zipWith=dr});
diff --git a/docs/README.md b/docs/README.md
index 6f1a90c6..59c81b8b 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -789,7 +789,7 @@ describe('R.any', () => {
 
 ```typescript
 
-anyPass<T, U extends T[]>(predicates: { [K in keyof U]: (x: T) => x is U[K]
+anyPass<T>(predicates: ((x: T) => boolean)[]): (input: T) => boolean
 ```
 
 It accepts list of `predicates` and returns a function. This function with its `input` will return `true`, if any of `predicates` returns `true` for this `input`.
@@ -801,7 +801,6 @@ It accepts list of `predicates` and returns a function. This function with its `
 <summary>All TypeScript definitions</summary>
 
 ```typescript
-anyPass<T, U extends T[]>(predicates: { [K in keyof U]: (x: T) => x is U[K]; }): (input: T) => input is U[number];
 anyPass<T>(predicates: ((x: T) => boolean)[]): (input: T) => boolean;
 anyPass<T>(predicates: ((...inputs: T[]) => boolean)[]): (...inputs: T[]) => boolean;
 ```
@@ -930,18 +929,18 @@ describe('anyPass', () => {
     filtered2 // $ExpectType number[]
   })
   it('functions as a type guard', () => {
-    const isString = (x: unknown): x is string => typeof x === 'string';
-    const isNumber = (x: unknown): x is number => typeof x === 'number';
-    const isBoolean = (x: unknown): x is boolean => typeof x === 'boolean';
-    
-    const isStringNumberOrBoolean = anyPass([isString, isNumber, isBoolean]);
+    const isString = (x: unknown): x is string => typeof x === 'string'
+    const isNumber = (x: unknown): x is number => typeof x === 'number'
+    const isBoolean = (x: unknown): x is boolean => typeof x === 'boolean'
+
+    const isStringNumberOrBoolean = anyPass([isString, isNumber, isBoolean])
 
-    isStringNumberOrBoolean // $ExpectType (input: unknown) => input is string | number | boolean
+    isStringNumberOrBoolean // $ExpectType (input: unknown) => boolean
 
-    const aValue: unknown = 1;
+    const aValue: unknown = 1
 
     if (isStringNumberOrBoolean(aValue)) {
-      aValue // $ExpectType string | number | boolean
+      aValue // $ExpectType unknown
     }
   })
 })
@@ -3438,6 +3437,10 @@ describe('R.dropRepeats', () => {
 
 [![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#dropRepeats)
 
+### dropRepeatsBy
+
+[![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#dropRepeatsBy)
+
 ### dropRepeatsWith
 
 <a title="redirect to Rambda Repl site" href="https://rambda.now.sh?const%20list%20%3D%20%5B%7Ba%3A1%2Cb%3A2%7D%2C%20%7Ba%3A1%2Cb%3A3%7D%2C%20%7Ba%3A2%2C%20b%3A4%7D%5D%0Aconst%20result%20%3D%20R.dropRepeatsWith(R.prop('a')%2C%20list)%0A%0A%2F%2F%20%3D%3E%20%5B%7Ba%3A1%2Cb%3A2%7D%2C%20%7Ba%3A2%2C%20b%3A4%7D%5D">Try this <strong>R.dropRepeatsWith</strong> example in Rambda REPL</a>
@@ -3603,6 +3606,10 @@ describe('R.either', () => {
 
 [![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#either)
 
+### empty
+
+[![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#empty)
+
 ### endsWith
 
 ```typescript
@@ -3764,6 +3771,10 @@ describe('R.endsWith - string', () => {
 
 [![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#endsWith)
 
+### eqBy
+
+[![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#eqBy)
+
 ### eqProps
 
 It returns `true` if property `prop` in `obj1` is equal to property `prop` in `obj2` according to `R.equals`.
@@ -5422,36 +5433,46 @@ forEach<T, U>(fn: ObjectIterator<T, void>): (list: Dictionary<T>) => Dictionary<
 import { isArray } from './_internals/isArray.js'
 import { keys } from './_internals/keys.js'
 
-export function forEach(fn, list){
-  if (arguments.length === 1) return _list => forEach(fn, _list)
+export function forEachObjIndexedFn(fn, obj){
+  let index = 0
+  const listKeys = keys(obj)
+  const len = listKeys.length
 
-  if (list === undefined){
-    return
+  while (index < len){
+    const key = listKeys[ index ]
+    fn(
+      obj[ key ], key, obj
+    )
+    index++
   }
 
-  if (isArray(list)){
-    let index = 0
-    const len = list.length
+  return obj
+}
 
-    while (index < len){
-      fn(list[ index ])
-      index++
-    }
-  } else {
+export function forEachObjIndexed(fn, list){
+  if (arguments.length === 1) return _list => forEachObjIndexed(fn, _list)
+
+  if (list === undefined) return
+
+  return forEachObjIndexedFn(fn, list)
+}
+
+export function forEach(fn, iterable){
+  if (arguments.length === 1) return _list => forEach(fn, _list)
+
+  if (iterable === undefined) return
+
+  if (isArray(iterable)){
     let index = 0
-    const listKeys = keys(list)
-    const len = listKeys.length
+    const len = iterable.length
 
     while (index < len){
-      const key = listKeys[ index ]
-      fn(
-        list[ key ], key, list
-      )
+      fn(iterable[ index ])
       index++
     }
-  }
+  } else return forEachObjIndexedFn(fn, iterable)
 
-  return list
+  return iterable
 }
 ```
 
@@ -5582,6 +5603,10 @@ describe('R.forEach with objects', () => {
 
 [![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#forEach)
 
+### forEachObjIndexed
+
+[![---------------](https://raw.githubusercontent.com/selfrefactor/rambda/master/files/separator.png)](#forEachObjIndexed)
+
 ### fromPairs
 
 It transforms a `listOfPairs` to an object.
@@ -8780,7 +8805,7 @@ mergeWith<Output>(fn: (x: any, z: any) => any): <U, V>(a: U, b: V) => Output;
 ```javascript
 import { curry } from './curry.js'
 
-function mergeWithFn(
+export function mergeWithFn(
   mergeFn, aInput, bInput
 ){
   const a = aInput ?? {}
@@ -8788,21 +8813,15 @@ function mergeWithFn(
   const willReturn = {}
 
   Object.keys(a).forEach(key => {
-    if (b[ key ] === undefined){
-      willReturn[ key ] = a[ key ]
-    } else {
-      willReturn[ key ] = mergeFn(a[ key ], b[ key ])
-    }
+    if (b[ key ] === undefined) willReturn[ key ] = a[ key ]
+    else willReturn[ key ] = mergeFn(a[ key ], b[ key ])
   })
 
   Object.keys(b).forEach(key => {
     if (willReturn[ key ] !== undefined) return
 
-    if (a[ key ] === undefined){
-      willReturn[ key ] = b[ key ]
-    } else {
-      willReturn[ key ] = mergeFn(a[ key ], b[ key ])
-    }
+    if (a[ key ] === undefined) willReturn[ key ] = b[ key ]
+    else willReturn[ key ] = mergeFn(a[ key ], b[ key ])
   })
 
   return willReturn
@@ -8819,10 +8838,10 @@ export const mergeWith = curry(mergeWithFn)
 
 ```javascript
 import { concat } from './concat.js'
-import { mergeWith } from './mergeWith.js'
+import { mergeWithFn } from './mergeWith.js'
 
 test('happy', () => {
-  const result = mergeWith(
+  const result = mergeWithFn(
     concat,
     {
       a      : true,
@@ -8835,8 +8854,8 @@ test('happy', () => {
   )
   const expected = {
     a      : true,
-    values : [ 10, 20, 15, 35 ],
     b      : true,
+    values : [ 10, 20, 15, 35 ],
   }
   expect(result).toEqual(expected)
 })
@@ -8844,31 +8863,31 @@ test('happy', () => {
 // https://github.com/ramda/ramda/pull/3222/files#diff-d925d9188b478d2f1d4b26012c6dddac374f9e9d7a336604d654b9a113bfc857
 describe('acts as if nil values are simply empty objects', () => {
   it('if the first object is nil and the second empty', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, undefined, {}
     )).toEqual({})
   })
 
   it('if the first object is empty and the second nil', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, {}, null
     )).toEqual({})
   })
 
   it('if both objects are nil', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, undefined, null
     )).toEqual({})
   })
 
   it('if the first object is not empty and the second is nil', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, { a : 'a' }, null
     )).toEqual({ a : 'a' })
   })
 
   it('if the first object is nil and the second is not empty', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, undefined, { a : 'a' }
     )).toEqual({ a : 'a' })
   })
@@ -10073,18 +10092,7 @@ test('index lens', () => {
 
 ```typescript
 
-partial<
-  Args extends unknown[],
-  ArgsGiven extends [...Partial<Args>],
-  R
->(
-  fn: (...args: Args) => R,
-  ...args: ArgsGiven
-): Args extends [...{[K in keyof ArgsGiven]: Args[K]}, ...infer ArgsRemaining]
-  ? ArgsRemaining extends []
-    ? R
-    : (...args: ArgsRemaining) => R
-  : never
+partial<V0, V1, T>(fn: (x0: V0, x1: V1) => T, args: [V0]): (x1: V1) => T
 ```
 
 It is very similar to `R.curry`, but you can pass initial arguments when you create the curried function.
@@ -10099,31 +10107,22 @@ The name comes from the fact that you partially inject the inputs.
 <summary>All TypeScript definitions</summary>
 
 ```typescript
-partial<
-  Args extends unknown[],
-  ArgsGiven extends [...Partial<Args>],
-  R
->(
-  fn: (...args: Args) => R,
-  ...args: ArgsGiven
-): Args extends [...{[K in keyof ArgsGiven]: Args[K]}, ...infer ArgsRemaining]
-  ? ArgsRemaining extends []
-    ? R
-    : (...args: ArgsRemaining) => R
-  : never;
-
-partial<
-  Args extends readonly unknown[],
-  ArgsGiven extends [...Partial<Args>],
-  R
->(
-  fn: (...args: Args) => R,
-  args: ArgsGiven
-): Args extends [...{[K in keyof ArgsGiven]: Args[K]}, ...infer ArgsRemaining]
-  ? ArgsRemaining extends []
-    ? R
-    : (...args: ArgsRemaining) => R
-  : never;
+partial<V0, V1, T>(fn: (x0: V0, x1: V1) => T, args: [V0]): (x1: V1) => T;
+partial<V0, V1, V2, T>(fn: (x0: V0, x1: V1, x2: V2) => T, args: [V0, V1]): (x2: V2) => T;
+partial<V0, V1, V2, T>(fn: (x0: V0, x1: V1, x2: V2) => T, args: [V0]): (x1: V1, x2: V2) => T;
+partial<V0, V1, V2, V3, T>(
+  fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T,
+  args: [V0, V1, V2],
+): (x2: V3) => T;
+partial<V0, V1, V2, V3, T>(
+  fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T,
+  args: [V0, V1],
+): (x2: V2, x3: V3) => T;
+partial<V0, V1, V2, V3, T>(
+  fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T,
+  args: [V0],
+): (x1: V1, x2: V2, x3: V3) => T;
+partial<T>(fn: (...a: any[]) => T, args: any[]): (...a: any[]) => T;
 ```
 
 </details>
@@ -10240,44 +10239,20 @@ describe('R.partial', () => {
       aBoolean: boolean,
       aNull: null
     ) {
-      return { aString, aNumber, aBoolean, aNull }
+      return {aString, aNumber, aBoolean, aNull}
     }
 
     // @ts-expect-error
-    partial(fn, 1);
-
-    const fn1 = partial(fn, 'a')
-
-    // @ts-expect-error
-    partial(fn1, 'b');
-
-    const fn2 = partial(fn1, 2)
-    const result = fn2(true, null)
-    result // $ExpectType { aString: string; aNumber: number; aBoolean: boolean; aNull: null; }
-  })
-
-  it('ramda', () => {
-    function fn(
-      aString: string,
-      aNumber: number,
-      aBoolean: boolean,
-      aNull: null
-    ) {
-      return { aString, aNumber, aBoolean, aNull }
-    }
-
-    // @ts-expect-error
-    partial(fn, 1);
+    partial(fn, 1)
 
     const fn1 = partial(fn, ['a'])
-
-    // @ts-expect-error
-    partial(fn1, ['b']);
+    partial(fn1, ['b'])
 
     const fn2 = partial(fn1, [2])
     const result = fn2(true, null)
     result // $ExpectType { aString: string; aNumber: number; aBoolean: boolean; aNull: null; }
-  })})
+  })
+})
 ```
 
 </details>
@@ -17452,6 +17427,20 @@ describe('R.zipWith', () => {
 
 ## ❯ CHANGELOG
 
+8.5.0
+
+- Revert changes in `R.anyPass` introduced in `8.4.0` release. The reason is that the change was breaking the library older than `5.2.0` TypeScript.
+
+- Wrong `R.partial` TS definition  - [Issue #705](https://github.com/selfrefactor/rambda/issues/705)
+
+- Add `R.dropRepeatsBy`
+
+- Add `R.empty`
+
+- Add `R.eqBy`
+
+- Add `R.forEachObjIndexed`
+
 8.4.0
 
 - Add `R.dissocPath`
diff --git a/files/index.d.ts b/files/index.d.ts
index 34a69890..ee7ae9fc 100644
--- a/files/index.d.ts
+++ b/files/index.d.ts
@@ -393,7 +393,6 @@ Notes:
 
 */
 // @SINGLE_MARKER
-export function anyPass<T, U extends T[]>(predicates: { [K in keyof U]: (x: T) => x is U[K]; }): (input: T) => input is U[number];
 export function anyPass<T>(predicates: ((x: T) => boolean)[]): (input: T) => boolean;
 export function anyPass<T>(predicates: ((...inputs: T[]) => boolean)[]): (...inputs: T[]) => boolean;
 
@@ -2807,31 +2806,22 @@ Notes: Rambda's partial doesn't need the input arguments to be wrapped as array.
 
 */
 // @SINGLE_MARKER
-export function partial<
-  Args extends unknown[],
-  ArgsGiven extends [...Partial<Args>],
-  R
->(
-  fn: (...args: Args) => R,
-  ...args: ArgsGiven
-): Args extends [...{[K in keyof ArgsGiven]: Args[K]}, ...infer ArgsRemaining]
-  ? ArgsRemaining extends []
-    ? R
-    : (...args: ArgsRemaining) => R
-  : never;
-
-export function partial<
-  Args extends readonly unknown[],
-  ArgsGiven extends [...Partial<Args>],
-  R
->(
-  fn: (...args: Args) => R,
-  args: ArgsGiven
-): Args extends [...{[K in keyof ArgsGiven]: Args[K]}, ...infer ArgsRemaining]
-  ? ArgsRemaining extends []
-    ? R
-    : (...args: ArgsRemaining) => R
-  : never;
+export function partial<V0, V1, T>(fn: (x0: V0, x1: V1) => T, args: [V0]): (x1: V1) => T;
+export function partial<V0, V1, V2, T>(fn: (x0: V0, x1: V1, x2: V2) => T, args: [V0, V1]): (x2: V2) => T;
+export function partial<V0, V1, V2, T>(fn: (x0: V0, x1: V1, x2: V2) => T, args: [V0]): (x1: V1, x2: V2) => T;
+export function partial<V0, V1, V2, V3, T>(
+  fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T,
+  args: [V0, V1, V2],
+): (x2: V3) => T;
+export function partial<V0, V1, V2, V3, T>(
+  fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T,
+  args: [V0, V1],
+): (x2: V2, x3: V3) => T;
+export function partial<V0, V1, V2, V3, T>(
+  fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T,
+  args: [V0],
+): (x1: V1, x2: V2, x3: V3) => T;
+export function partial<T>(fn: (...a: any[]) => T, args: any[]): (...a: any[]) => T;
 
 
 /*
@@ -5624,6 +5614,88 @@ Notes:
 export function removeIndex<T>(index: number, list: T[]): T[];
 export function removeIndex(index: number): <T>(list: T[]) => T[];
 
+/*
+Method: dropRepeatsBy
+
+Explanation:
+
+Example:
+
+```
+```
+
+Categories:
+
+Notes:
+
+*/
+// @SINGLE_MARKER
+export function dropRepeatsBy<T, U>(fn: (a: T) => U, list: T[]): T[];
+export function dropRepeatsBy<T, U>(
+  fn: (a: T) => U
+): (list: T[]) => T[];
+export function dropRepeatsBy(fn: any): <T>(list: T[]) => T[];
+
+/*
+Method: empty
+
+Explanation:
+
+Example:
+
+```
+```
+
+Categories:
+
+Notes:
+
+*/
+// @SINGLE_MARKER
+export function empty<T>(x: T): T;
+
+/*
+Method: eqBy
+
+Explanation:
+
+Example:
+
+```
+```
+
+Categories:
+
+Notes:
+
+*/
+// @SINGLE_MARKER
+export function eqBy<T>(fn: (a: T) => unknown, a: T, b: T): boolean;
+export function eqBy<T>(fn: (a: T) => unknown, a: T): (b: T) => boolean;
+export function eqBy<T>(fn: (a: T) => unknown): {
+  (a: T, b: T): boolean;
+  (a: T): (b: T) => boolean;
+};
+
+/*
+Method: forEachObjIndexed
+
+Explanation:
+
+Example:
+
+```
+```
+
+Categories:
+
+Notes:
+
+*/
+// @SINGLE_MARKER
+export function forEachObjIndexed<T>(fn: (value: T[keyof T], key: keyof T, obj: T) => void, obj: T): T;
+export function forEachObjIndexed<T>(fn: (value: T[keyof T], key: keyof T, obj: T) => void): (obj: T) => T;
+
 // RAMBDAX_MARKER_START
 
 /*
diff --git a/immutable.d.ts b/immutable.d.ts
index 71f0718a..fbc2a69b 100644
--- a/immutable.d.ts
+++ b/immutable.d.ts
@@ -231,7 +231,6 @@ export function any<T>(predicate: (x: T) => boolean): (list: readonly T[]) => bo
 /**
  * It accepts list of `predicates` and returns a function. This function with its `input` will return `true`, if any of `predicates` returns `true` for this `input`.
  */
-export function anyPass<T, U extends readonly T[]>(predicates: { readonly [K in keyof U]: (x: T) => x is U[K]; }): (input: T) => input is U[number];
 export function anyPass<T>(predicates: readonly ((x: T) => boolean)[]): (input: T) => boolean;
 export function anyPass<T>(predicates: readonly ((...inputs: readonly T[]) => boolean)[]): (...inputs: readonly T[]) => boolean;
 
@@ -541,6 +540,12 @@ export function dropLastWhile<T>(predicate: (x: T) => boolean): <T>(iterable: re
  */
 export function dropRepeats<T>(list: readonly T[]): readonly T[];
 
+export function dropRepeatsBy<T, U>(fn: (a: T) => U, list: readonly T[]): readonly T[];
+export function dropRepeatsBy<T, U>(
+  fn: (a: T) => U
+): (list: readonly T[]) => readonly T[];
+export function dropRepeatsBy(fn: any): <T>(list: readonly T[]) => readonly T[];
+
 export function dropRepeatsWith<T>(predicate: (x: T, y: T) => boolean, list: readonly T[]): readonly T[];
 export function dropRepeatsWith<T>(predicate: (x: T, y: T) => boolean): (list: readonly T[]) => readonly T[];
 
@@ -559,6 +564,8 @@ export function either<T>(firstPredicate: Predicate<T>, secondPredicate: Predica
 export function either<T>(firstPredicate: Predicate<T>): (secondPredicate: Predicate<T>) => Predicate<T>;
 export function either(firstPredicate: Pred): (secondPredicate: Pred) => Pred;
 
+export function empty<T>(x: T): T;
+
 /**
  * When iterable is a string, then it behaves as `String.prototype.endsWith`.
  * When iterable is a list, then it uses R.equals to determine if the target list ends in the same way as the given target.
@@ -568,6 +575,13 @@ export function endsWith<T extends string>(question: T): (str: string) => boolea
 export function endsWith<T>(question: readonly T[], list: readonly T[]): boolean;
 export function endsWith<T>(question: readonly T[]): (list: readonly T[]) => boolean;
 
+export function eqBy<T>(fn: (a: T) => unknown, a: T, b: T): boolean;
+export function eqBy<T>(fn: (a: T) => unknown, a: T): (b: T) => boolean;
+export function eqBy<T>(fn: (a: T) => unknown): {
+  (a: T, b: T): boolean;
+  (a: T): (b: T) => boolean;
+};
+
 /**
  * It returns `true` if property `prop` in `obj1` is equal to property `prop` in `obj2` according to `R.equals`.
  */
@@ -647,6 +661,9 @@ export function forEach<T>(fn: Iterator<T, void>): (list: readonly T[]) => reado
 export function forEach<T>(fn: ObjectIterator<T, void>, list: Dictionary<T>): Dictionary<T>;
 export function forEach<T, U>(fn: ObjectIterator<T, void>): (list: Dictionary<T>) => Dictionary<T>;
 
+export function forEachObjIndexed<T>(fn: (value: T[keyof T], key: keyof T, obj: T) => void, obj: T): T;
+export function forEachObjIndexed<T>(fn: (value: T[keyof T], key: keyof T, obj: T) => void): (obj: T) => T;
+
 /**
  * It transforms a `listOfPairs` to an object.
  */
@@ -1096,31 +1113,22 @@ export function over(lens: Lens): <T>(fn: Arity1Fn, value: readonly T[]) => read
  * `R.partial` will keep returning a function until all the arguments that the function `fn` expects are passed.
  * The name comes from the fact that you partially inject the inputs.
  */
-export function partial<
-  Args extends readonly unknown[],
-  ArgsGiven extends readonly [...Partial<Args>],
-  R
->(
-  fn: (...args: Args) => R,
-  ...args: ArgsGiven
-): Args extends readonly [...{ readonly[K in keyof ArgsGiven]: Args[K]}, ...infer ArgsRemaining]
-  ? ArgsRemaining extends readonly []
-    ? R
-    : (...args: ArgsRemaining) => R
-  : never;
-
-export function partial<
-  Args extends readonly unknown[],
-  ArgsGiven extends readonly [...Partial<Args>],
-  R
->(
-  fn: (...args: Args) => R,
-  args: ArgsGiven
-): Args extends readonly [...{ readonly[K in keyof ArgsGiven]: Args[K]}, ...infer ArgsRemaining]
-  ? ArgsRemaining extends readonly []
-    ? R
-    : (...args: ArgsRemaining) => R
-  : never;
+export function partial<V0, V1, T>(fn: (x0: V0, x1: V1) => T, args: readonly [V0]): (x1: V1) => T;
+export function partial<V0, V1, V2, T>(fn: (x0: V0, x1: V1, x2: V2) => T, args: readonly [V0, V1]): (x2: V2) => T;
+export function partial<V0, V1, V2, T>(fn: (x0: V0, x1: V1, x2: V2) => T, args: readonly [V0]): (x1: V1, x2: V2) => T;
+export function partial<V0, V1, V2, V3, T>(
+  fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T,
+  args: readonly [V0, V1, V2],
+): (x2: V3) => T;
+export function partial<V0, V1, V2, V3, T>(
+  fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T,
+  args: readonly [V0, V1],
+): (x2: V2, x3: V3) => T;
+export function partial<V0, V1, V2, V3, T>(
+  fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T,
+  args: readonly [V0],
+): (x1: V1, x2: V2, x3: V3) => T;
+export function partial<T>(fn: (...a: readonly any[]) => T, args: readonly any[]): (...a: readonly any[]) => T;
 
 /**
  * `R.partialObject` is a curry helper designed specifically for functions accepting object as a single argument.
diff --git a/index.d.ts b/index.d.ts
index 1278a0dc..4c755c6d 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -231,7 +231,6 @@ export function any<T>(predicate: (x: T) => boolean): (list: T[]) => boolean;
 /**
  * It accepts list of `predicates` and returns a function. This function with its `input` will return `true`, if any of `predicates` returns `true` for this `input`.
  */
-export function anyPass<T, U extends T[]>(predicates: { [K in keyof U]: (x: T) => x is U[K]; }): (input: T) => input is U[number];
 export function anyPass<T>(predicates: ((x: T) => boolean)[]): (input: T) => boolean;
 export function anyPass<T>(predicates: ((...inputs: T[]) => boolean)[]): (...inputs: T[]) => boolean;
 
@@ -541,6 +540,12 @@ export function dropLastWhile<T>(predicate: (x: T) => boolean): <T>(iterable: T[
  */
 export function dropRepeats<T>(list: T[]): T[];
 
+export function dropRepeatsBy<T, U>(fn: (a: T) => U, list: T[]): T[];
+export function dropRepeatsBy<T, U>(
+  fn: (a: T) => U
+): (list: T[]) => T[];
+export function dropRepeatsBy(fn: any): <T>(list: T[]) => T[];
+
 export function dropRepeatsWith<T>(predicate: (x: T, y: T) => boolean, list: T[]): T[];
 export function dropRepeatsWith<T>(predicate: (x: T, y: T) => boolean): (list: T[]) => T[];
 
@@ -559,6 +564,8 @@ export function either<T>(firstPredicate: Predicate<T>, secondPredicate: Predica
 export function either<T>(firstPredicate: Predicate<T>): (secondPredicate: Predicate<T>) => Predicate<T>;
 export function either(firstPredicate: Pred): (secondPredicate: Pred) => Pred;
 
+export function empty<T>(x: T): T;
+
 /**
  * When iterable is a string, then it behaves as `String.prototype.endsWith`.
  * When iterable is a list, then it uses R.equals to determine if the target list ends in the same way as the given target.
@@ -568,6 +575,13 @@ export function endsWith<T extends string>(question: T): (str: string) => boolea
 export function endsWith<T>(question: T[], list: T[]): boolean;
 export function endsWith<T>(question: T[]): (list: T[]) => boolean;
 
+export function eqBy<T>(fn: (a: T) => unknown, a: T, b: T): boolean;
+export function eqBy<T>(fn: (a: T) => unknown, a: T): (b: T) => boolean;
+export function eqBy<T>(fn: (a: T) => unknown): {
+  (a: T, b: T): boolean;
+  (a: T): (b: T) => boolean;
+};
+
 /**
  * It returns `true` if property `prop` in `obj1` is equal to property `prop` in `obj2` according to `R.equals`.
  */
@@ -647,6 +661,9 @@ export function forEach<T>(fn: Iterator<T, void>): (list: T[]) => T[];
 export function forEach<T>(fn: ObjectIterator<T, void>, list: Dictionary<T>): Dictionary<T>;
 export function forEach<T, U>(fn: ObjectIterator<T, void>): (list: Dictionary<T>) => Dictionary<T>;
 
+export function forEachObjIndexed<T>(fn: (value: T[keyof T], key: keyof T, obj: T) => void, obj: T): T;
+export function forEachObjIndexed<T>(fn: (value: T[keyof T], key: keyof T, obj: T) => void): (obj: T) => T;
+
 /**
  * It transforms a `listOfPairs` to an object.
  */
@@ -1096,31 +1113,22 @@ export function over(lens: Lens): <T>(fn: Arity1Fn, value: T[]) => T[];
  * `R.partial` will keep returning a function until all the arguments that the function `fn` expects are passed.
  * The name comes from the fact that you partially inject the inputs.
  */
-export function partial<
-  Args extends unknown[],
-  ArgsGiven extends [...Partial<Args>],
-  R
->(
-  fn: (...args: Args) => R,
-  ...args: ArgsGiven
-): Args extends [...{[K in keyof ArgsGiven]: Args[K]}, ...infer ArgsRemaining]
-  ? ArgsRemaining extends []
-    ? R
-    : (...args: ArgsRemaining) => R
-  : never;
-
-export function partial<
-  Args extends readonly unknown[],
-  ArgsGiven extends [...Partial<Args>],
-  R
->(
-  fn: (...args: Args) => R,
-  args: ArgsGiven
-): Args extends [...{[K in keyof ArgsGiven]: Args[K]}, ...infer ArgsRemaining]
-  ? ArgsRemaining extends []
-    ? R
-    : (...args: ArgsRemaining) => R
-  : never;
+export function partial<V0, V1, T>(fn: (x0: V0, x1: V1) => T, args: [V0]): (x1: V1) => T;
+export function partial<V0, V1, V2, T>(fn: (x0: V0, x1: V1, x2: V2) => T, args: [V0, V1]): (x2: V2) => T;
+export function partial<V0, V1, V2, T>(fn: (x0: V0, x1: V1, x2: V2) => T, args: [V0]): (x1: V1, x2: V2) => T;
+export function partial<V0, V1, V2, V3, T>(
+  fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T,
+  args: [V0, V1, V2],
+): (x2: V3) => T;
+export function partial<V0, V1, V2, V3, T>(
+  fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T,
+  args: [V0, V1],
+): (x2: V2, x3: V3) => T;
+export function partial<V0, V1, V2, V3, T>(
+  fn: (x0: V0, x1: V1, x2: V2, x3: V3) => T,
+  args: [V0],
+): (x1: V1, x2: V2, x3: V3) => T;
+export function partial<T>(fn: (...a: any[]) => T, args: any[]): (...a: any[]) => T;
 
 /**
  * `R.partialObject` is a curry helper designed specifically for functions accepting object as a single argument.
diff --git a/package.json b/package.json
index 67c0173a..56ce9bd2 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,7 @@
     "test:all": "jest source/*.spec.js -u --bail=false",
     "test:ci": "jest source/*.spec.js --coverage --no-cache -w 1",
     "test:typings": "dtslint --localTs ./node_modules/typescript/lib --expectOnly ./source",
+    "ts": "yarn test:typings",
     "usedby": "cd ../rambda-scripts && yarn usedby",
     "x": "yarn populatedocs:x && yarn populatereadme:x && yarn immutable:x"
   },
diff --git a/rambda.js b/rambda.js
index 2576136b..0634725b 100644
--- a/rambda.js
+++ b/rambda.js
@@ -51,10 +51,13 @@ export * from './src/drop.js'
 export * from './src/dropLast.js'
 export * from './src/dropLastWhile.js'
 export * from './src/dropRepeats.js'
+export * from './src/dropRepeatsBy.js'
 export * from './src/dropRepeatsWith.js'
 export * from './src/dropWhile.js'
 export * from './src/either.js'
+export * from './src/empty.js'
 export * from './src/endsWith.js'
+export * from './src/eqBy.js'
 export * from './src/eqProps.js'
 export * from './src/equals.js'
 export * from './src/evolve.js'
diff --git a/source/anyPass-spec.ts b/source/anyPass-spec.ts
index 16f332c0..583ac6cc 100644
--- a/source/anyPass-spec.ts
+++ b/source/anyPass-spec.ts
@@ -33,18 +33,18 @@ describe('anyPass', () => {
     filtered2 // $ExpectType number[]
   })
   it('functions as a type guard', () => {
-    const isString = (x: unknown): x is string => typeof x === 'string';
-    const isNumber = (x: unknown): x is number => typeof x === 'number';
-    const isBoolean = (x: unknown): x is boolean => typeof x === 'boolean';
-    
-    const isStringNumberOrBoolean = anyPass([isString, isNumber, isBoolean]);
+    const isString = (x: unknown): x is string => typeof x === 'string'
+    const isNumber = (x: unknown): x is number => typeof x === 'number'
+    const isBoolean = (x: unknown): x is boolean => typeof x === 'boolean'
 
-    isStringNumberOrBoolean // $ExpectType (input: unknown) => input is string | number | boolean
+    const isStringNumberOrBoolean = anyPass([isString, isNumber, isBoolean])
 
-    const aValue: unknown = 1;
+    isStringNumberOrBoolean // $ExpectType (input: unknown) => boolean
+
+    const aValue: unknown = 1
 
     if (isStringNumberOrBoolean(aValue)) {
-      aValue // $ExpectType string | number | boolean
+      aValue // $ExpectType unknown
     }
   })
 })
diff --git a/source/dropRepeatsBy.js b/source/dropRepeatsBy.js
new file mode 100644
index 00000000..285918ea
--- /dev/null
+++ b/source/dropRepeatsBy.js
@@ -0,0 +1,21 @@
+import { equals } from './equals.js'
+
+export function dropRepeatsBy(fn, list){
+  if (arguments.length === 1) return _list => dropRepeatsBy(fn, _list)
+
+  let lastEvaluated = null
+
+  return list.slice().filter(item => {
+    if (lastEvaluated === null){
+      lastEvaluated = fn(item)
+
+      return true
+    }
+    const evaluatedResult = fn(item)
+    if (equals(lastEvaluated, evaluatedResult)) return false
+
+    lastEvaluated = evaluatedResult
+
+    return true
+  })
+}
diff --git a/source/dropRepeatsBy.spec.js b/source/dropRepeatsBy.spec.js
new file mode 100644
index 00000000..37489ee7
--- /dev/null
+++ b/source/dropRepeatsBy.spec.js
@@ -0,0 +1,59 @@
+import { dropRepeatsBy } from './dropRepeatsBy.js'
+
+test('happy', () => {
+  const fn = ({ i }) => ({ i : Math.abs(i) })
+  const objs = [ { i : 1 }, { i : 2 }, { i : 3 }, { i : -4 }, { i : 5 }, { i : 3 } ]
+  const objs2 = [
+    { i : 1 },
+    { i : -1 },
+    { i : 1 },
+    { i : 2 },
+    { i : 3 },
+    { i : 3 },
+    { i : -4 },
+    { i : 4 },
+    { i : 5 },
+    { i : 3 },
+  ]
+  expect(dropRepeatsBy(fn, objs2)).toEqual(objs)
+  expect(dropRepeatsBy(fn, objs)).toEqual(objs)
+})
+
+test('keeps elements from the left', () => {
+  expect(dropRepeatsBy(({ n, ...rest }) => ({ ...rest }),
+    [
+      {
+        i : 1,
+        n : 1,
+      },
+      {
+        i : 1,
+        n : 2,
+      },
+      {
+        i : 1,
+        n : 3,
+      },
+      {
+        i : 4,
+        n : 1,
+      },
+      {
+        i : 4,
+        n : 2,
+      },
+    ])).toEqual([
+    {
+      i : 1,
+      n : 1,
+    },
+    {
+      i : 4,
+      n : 1,
+    },
+  ])
+})
+
+test('returns an empty array for an empty array', () => {
+  expect(dropRepeatsBy(() => {}, [])).toEqual([])
+})
diff --git a/source/empty.js b/source/empty.js
new file mode 100644
index 00000000..7d7cdd9a
--- /dev/null
+++ b/source/empty.js
@@ -0,0 +1,15 @@
+import { type } from './type.js'
+
+export function empty(list){
+  if (typeof list === 'string') return ''
+
+  if (Array.isArray(list)){
+    const { name } = list.constructor
+    if (name === 'Uint8Array') return Uint8Array.from('')
+
+    if (name === 'Float32Array') return new Float32Array([])
+
+    return []
+  }
+  if (type(list) === 'Object') return {}
+}
diff --git a/source/empty.spec.js b/source/empty.spec.js
new file mode 100644
index 00000000..f98e0095
--- /dev/null
+++ b/source/empty.spec.js
@@ -0,0 +1,22 @@
+import { empty } from 'ramda'
+
+test('returns empty array given array', () => {
+  expect(empty([ 1, 2, 3 ])).toEqual([])
+})
+
+test('returns empty array of equivalent type given typed array', () => {
+  expect(empty(Uint8Array.from('123'))).toEqual(Uint8Array.from(''))
+  expect(empty(Uint8Array.from('123')).constructor.name).toBe('Uint8Array')
+  expect(empty(new Float32Array([ 1, 2, 3 ]))).toEqual(new Float32Array([]))
+  expect(empty(new Float32Array([ 1, 2, 3 ])).constructor.name).toBe('Float32Array')
+})
+
+test('returns empty string given string', () => {
+  expect(empty('abc')).toBe('')
+  expect(empty(new String('abc'))).toBe('')
+})
+
+test('other types', () => {
+  expect(empty({ a : 1 })).toEqual({})
+  expect(empty(/foo/g)).toBeUndefined()
+})
diff --git a/source/eqBy.js b/source/eqBy.js
new file mode 100644
index 00000000..b20a6342
--- /dev/null
+++ b/source/eqBy.js
@@ -0,0 +1,10 @@
+import { curry } from './curry.js'
+import { equals } from './equals.js'
+
+export function eqByFn(
+  fn, a, b
+){
+  return equals(fn(a), fn(b))
+}
+
+export const eqBy = curry(eqByFn)
diff --git a/source/eqBy.spec.js b/source/eqBy.spec.js
new file mode 100644
index 00000000..40e19947
--- /dev/null
+++ b/source/eqBy.spec.js
@@ -0,0 +1,34 @@
+import { eqByFn } from './eqBy.js'
+
+test('deteremines whether two values map to the same value in the codomain', () => {
+  expect(eqByFn(
+    Math.abs, 5, 5
+  )).toBe(true)
+  expect(eqByFn(
+    Math.abs, 5, -5
+  )).toBe(true)
+  expect(eqByFn(
+    Math.abs, -5, 5
+  )).toBe(true)
+  expect(eqByFn(
+    Math.abs, -5, -5
+  )).toBe(true)
+  expect(eqByFn(
+    Math.abs, 42, 99
+  )).toBe(false)
+})
+
+test('has R.equals semantics', () => {
+  expect(eqByFn(
+    Math.abs, NaN, NaN
+  )).toBe(true)
+  expect(eqByFn(
+    Math.abs, [ 42 ], [ 42 ]
+  )).toBe(true)
+  expect(eqByFn(
+    x => x, { a : 1 }, { a : 1 }
+  )).toBe(true)
+  expect(eqByFn(
+    x => x, { a : 1 }, { a : 2 }
+  )).toBe(false)
+})
diff --git a/source/forEach.js b/source/forEach.js
index 4f7e6d3d..a320b28f 100644
--- a/source/forEach.js
+++ b/source/forEach.js
@@ -1,34 +1,44 @@
 import { isArray } from './_internals/isArray.js'
 import { keys } from './_internals/keys.js'
 
-export function forEach(fn, list){
-  if (arguments.length === 1) return _list => forEach(fn, _list)
+export function forEachObjIndexedFn(fn, obj){
+  let index = 0
+  const listKeys = keys(obj)
+  const len = listKeys.length
 
-  if (list === undefined){
-    return
+  while (index < len){
+    const key = listKeys[ index ]
+    fn(
+      obj[ key ], key, obj
+    )
+    index++
   }
 
-  if (isArray(list)){
-    let index = 0
-    const len = list.length
+  return obj
+}
 
-    while (index < len){
-      fn(list[ index ])
-      index++
-    }
-  } else {
+export function forEachObjIndexed(fn, list){
+  if (arguments.length === 1) return _list => forEachObjIndexed(fn, _list)
+
+  if (list === undefined) return
+
+  return forEachObjIndexedFn(fn, list)
+}
+
+export function forEach(fn, iterable){
+  if (arguments.length === 1) return _list => forEach(fn, _list)
+
+  if (iterable === undefined) return
+
+  if (isArray(iterable)){
     let index = 0
-    const listKeys = keys(list)
-    const len = listKeys.length
+    const len = iterable.length
 
     while (index < len){
-      const key = listKeys[ index ]
-      fn(
-        list[ key ], key, list
-      )
+      fn(iterable[ index ])
       index++
     }
-  }
+  } else return forEachObjIndexedFn(fn, iterable)
 
-  return list
+  return iterable
 }
diff --git a/source/mergeWith.js b/source/mergeWith.js
index 4eb00396..718e08da 100644
--- a/source/mergeWith.js
+++ b/source/mergeWith.js
@@ -1,6 +1,6 @@
 import { curry } from './curry.js'
 
-function mergeWithFn(
+export function mergeWithFn(
   mergeFn, aInput, bInput
 ){
   const a = aInput ?? {}
@@ -8,21 +8,15 @@ function mergeWithFn(
   const willReturn = {}
 
   Object.keys(a).forEach(key => {
-    if (b[ key ] === undefined){
-      willReturn[ key ] = a[ key ]
-    } else {
-      willReturn[ key ] = mergeFn(a[ key ], b[ key ])
-    }
+    if (b[ key ] === undefined) willReturn[ key ] = a[ key ]
+    else willReturn[ key ] = mergeFn(a[ key ], b[ key ])
   })
 
   Object.keys(b).forEach(key => {
     if (willReturn[ key ] !== undefined) return
 
-    if (a[ key ] === undefined){
-      willReturn[ key ] = b[ key ]
-    } else {
-      willReturn[ key ] = mergeFn(a[ key ], b[ key ])
-    }
+    if (a[ key ] === undefined) willReturn[ key ] = b[ key ]
+    else willReturn[ key ] = mergeFn(a[ key ], b[ key ])
   })
 
   return willReturn
diff --git a/source/mergeWith.spec.js b/source/mergeWith.spec.js
index f0970050..9efc64f5 100644
--- a/source/mergeWith.spec.js
+++ b/source/mergeWith.spec.js
@@ -1,8 +1,8 @@
 import { concat } from './concat.js'
-import { mergeWith } from './mergeWith.js'
+import { mergeWithFn } from './mergeWith.js'
 
 test('happy', () => {
-  const result = mergeWith(
+  const result = mergeWithFn(
     concat,
     {
       a      : true,
@@ -15,8 +15,8 @@ test('happy', () => {
   )
   const expected = {
     a      : true,
-    values : [ 10, 20, 15, 35 ],
     b      : true,
+    values : [ 10, 20, 15, 35 ],
   }
   expect(result).toEqual(expected)
 })
@@ -24,31 +24,31 @@ test('happy', () => {
 // https://github.com/ramda/ramda/pull/3222/files#diff-d925d9188b478d2f1d4b26012c6dddac374f9e9d7a336604d654b9a113bfc857
 describe('acts as if nil values are simply empty objects', () => {
   it('if the first object is nil and the second empty', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, undefined, {}
     )).toEqual({})
   })
 
   it('if the first object is empty and the second nil', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, {}, null
     )).toEqual({})
   })
 
   it('if both objects are nil', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, undefined, null
     )).toEqual({})
   })
 
   it('if the first object is not empty and the second is nil', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, { a : 'a' }, null
     )).toEqual({ a : 'a' })
   })
 
   it('if the first object is nil and the second is not empty', () => {
-    expect(mergeWith(
+    expect(mergeWithFn(
       concat, undefined, { a : 'a' }
     )).toEqual({ a : 'a' })
   })
diff --git a/source/partial-spec.ts b/source/partial-spec.ts
index 728e56ec..1107194f 100644
--- a/source/partial-spec.ts
+++ b/source/partial-spec.ts
@@ -8,41 +8,17 @@ describe('R.partial', () => {
       aBoolean: boolean,
       aNull: null
     ) {
-      return { aString, aNumber, aBoolean, aNull }
+      return {aString, aNumber, aBoolean, aNull}
     }
 
     // @ts-expect-error
-    partial(fn, 1);
-
-    const fn1 = partial(fn, 'a')
-
-    // @ts-expect-error
-    partial(fn1, 'b');
-
-    const fn2 = partial(fn1, 2)
-    const result = fn2(true, null)
-    result // $ExpectType { aString: string; aNumber: number; aBoolean: boolean; aNull: null; }
-  })
-
-  it('ramda', () => {
-    function fn(
-      aString: string,
-      aNumber: number,
-      aBoolean: boolean,
-      aNull: null
-    ) {
-      return { aString, aNumber, aBoolean, aNull }
-    }
-
-    // @ts-expect-error
-    partial(fn, 1);
+    partial(fn, 1)
 
     const fn1 = partial(fn, ['a'])
-
-    // @ts-expect-error
-    partial(fn1, ['b']);
+    partial(fn1, ['b'])
 
     const fn2 = partial(fn1, [2])
     const result = fn2(true, null)
     result // $ExpectType { aString: string; aNumber: number; aBoolean: boolean; aNull: null; }
-  })})
+  })
+})
diff --git a/src/dropRepeatsBy.js b/src/dropRepeatsBy.js
new file mode 100644
index 00000000..285918ea
--- /dev/null
+++ b/src/dropRepeatsBy.js
@@ -0,0 +1,21 @@
+import { equals } from './equals.js'
+
+export function dropRepeatsBy(fn, list){
+  if (arguments.length === 1) return _list => dropRepeatsBy(fn, _list)
+
+  let lastEvaluated = null
+
+  return list.slice().filter(item => {
+    if (lastEvaluated === null){
+      lastEvaluated = fn(item)
+
+      return true
+    }
+    const evaluatedResult = fn(item)
+    if (equals(lastEvaluated, evaluatedResult)) return false
+
+    lastEvaluated = evaluatedResult
+
+    return true
+  })
+}
diff --git a/src/empty.js b/src/empty.js
new file mode 100644
index 00000000..7d7cdd9a
--- /dev/null
+++ b/src/empty.js
@@ -0,0 +1,15 @@
+import { type } from './type.js'
+
+export function empty(list){
+  if (typeof list === 'string') return ''
+
+  if (Array.isArray(list)){
+    const { name } = list.constructor
+    if (name === 'Uint8Array') return Uint8Array.from('')
+
+    if (name === 'Float32Array') return new Float32Array([])
+
+    return []
+  }
+  if (type(list) === 'Object') return {}
+}
diff --git a/src/eqBy.js b/src/eqBy.js
new file mode 100644
index 00000000..b20a6342
--- /dev/null
+++ b/src/eqBy.js
@@ -0,0 +1,10 @@
+import { curry } from './curry.js'
+import { equals } from './equals.js'
+
+export function eqByFn(
+  fn, a, b
+){
+  return equals(fn(a), fn(b))
+}
+
+export const eqBy = curry(eqByFn)
diff --git a/src/forEach.js b/src/forEach.js
index 4f7e6d3d..a320b28f 100644
--- a/src/forEach.js
+++ b/src/forEach.js
@@ -1,34 +1,44 @@
 import { isArray } from './_internals/isArray.js'
 import { keys } from './_internals/keys.js'
 
-export function forEach(fn, list){
-  if (arguments.length === 1) return _list => forEach(fn, _list)
+export function forEachObjIndexedFn(fn, obj){
+  let index = 0
+  const listKeys = keys(obj)
+  const len = listKeys.length
 
-  if (list === undefined){
-    return
+  while (index < len){
+    const key = listKeys[ index ]
+    fn(
+      obj[ key ], key, obj
+    )
+    index++
   }
 
-  if (isArray(list)){
-    let index = 0
-    const len = list.length
+  return obj
+}
 
-    while (index < len){
-      fn(list[ index ])
-      index++
-    }
-  } else {
+export function forEachObjIndexed(fn, list){
+  if (arguments.length === 1) return _list => forEachObjIndexed(fn, _list)
+
+  if (list === undefined) return
+
+  return forEachObjIndexedFn(fn, list)
+}
+
+export function forEach(fn, iterable){
+  if (arguments.length === 1) return _list => forEach(fn, _list)
+
+  if (iterable === undefined) return
+
+  if (isArray(iterable)){
     let index = 0
-    const listKeys = keys(list)
-    const len = listKeys.length
+    const len = iterable.length
 
     while (index < len){
-      const key = listKeys[ index ]
-      fn(
-        list[ key ], key, list
-      )
+      fn(iterable[ index ])
       index++
     }
-  }
+  } else return forEachObjIndexedFn(fn, iterable)
 
-  return list
+  return iterable
 }
diff --git a/src/mergeWith.js b/src/mergeWith.js
index 4eb00396..718e08da 100644
--- a/src/mergeWith.js
+++ b/src/mergeWith.js
@@ -1,6 +1,6 @@
 import { curry } from './curry.js'
 
-function mergeWithFn(
+export function mergeWithFn(
   mergeFn, aInput, bInput
 ){
   const a = aInput ?? {}
@@ -8,21 +8,15 @@ function mergeWithFn(
   const willReturn = {}
 
   Object.keys(a).forEach(key => {
-    if (b[ key ] === undefined){
-      willReturn[ key ] = a[ key ]
-    } else {
-      willReturn[ key ] = mergeFn(a[ key ], b[ key ])
-    }
+    if (b[ key ] === undefined) willReturn[ key ] = a[ key ]
+    else willReturn[ key ] = mergeFn(a[ key ], b[ key ])
   })
 
   Object.keys(b).forEach(key => {
     if (willReturn[ key ] !== undefined) return
 
-    if (a[ key ] === undefined){
-      willReturn[ key ] = b[ key ]
-    } else {
-      willReturn[ key ] = mergeFn(a[ key ], b[ key ])
-    }
+    if (a[ key ] === undefined) willReturn[ key ] = b[ key ]
+    else willReturn[ key ] = mergeFn(a[ key ], b[ key ])
   })
 
   return willReturn