diff --git a/README.md b/README.md
index 23261d0..f4f4f7e 100644
--- a/README.md
+++ b/README.md
@@ -46,9 +46,9 @@ Being `abstract-leveldown` compliant means you can use many of the [Level module
 **If you are upgrading:** please see [UPGRADING.md](UPGRADING.md).
 
 ```js
-var levelup = require('levelup')
-var leveljs = require('level-js')
-var db = levelup(leveljs('bigdata'))
+const levelup = require('levelup')
+const leveljs = require('level-js')
+const db = levelup(leveljs('bigdata'))
 
 db.put('hello', Buffer.from('world'), function (err) {
   if (err) throw err
@@ -61,7 +61,7 @@ db.put('hello', Buffer.from('world'), function (err) {
 })
 ```
 
-In ES6 browsers:
+With `async/await`:
 
 ```js
 const levelup = require('levelup')
@@ -74,13 +74,13 @@ const value = await db.get('hello')
 
 ## Browser Support
 
-[![Sauce Test Status](https://saucelabs.com/browser-matrix/level-js.svg)](https://saucelabs.com/u/level-js)
+[![Sauce Test Status](https://app.saucelabs.com/browser-matrix/level-js.svg)](https://app.saucelabs.com/u/level-js)
 
 ## Type Support
 
 Keys and values can be a string or [`Buffer`][buffer]. Any other type will be irreversibly stringified. The only exceptions are `null` and `undefined`. Keys and values of that type are rejected.
 
-In order to sort string and Buffer keys the same way, for compatibility with `leveldown` and the larger ecosystem, `level-js` internally converts keys and values to binary before passing them to IndexedDB. If binary keys are not supported by the environment (like IE11) `level-js` falls back to `String(key)`.
+In order to sort string and Buffer keys the same way, for compatibility with `leveldown` and the larger ecosystem, `level-js` internally converts keys and values to binary before passing them to IndexedDB.
 
 If you desire non-destructive encoding (e.g. to store and retrieve numbers as-is), wrap `level-js` with [`encoding-down`][encoding-down]. Alternatively install [`level`][level] which conveniently bundles [`levelup`][levelup], `level-js` and `encoding-down`. Such an approach is also recommended if you want to achieve universal (isomorphic) behavior. For example, you could have [`leveldown`][leveldown] in a backend and `level-js` in the frontend. The `level` package does exactly that.
 
@@ -118,17 +118,6 @@ The optional `options` argument may contain:
 
 See [`IDBFactory#open`](https://developer.mozilla.org/en-US/docs/Web/API/IDBFactory/open) for more details.
 
-## Running Tests
-
-```sh
-git clone git@github.com:Level/level-js.git
-cd level-js
-npm install
-npm test
-```
-
-It will print out a URL to open in a browser of choice.
-
 ## Big Thanks
 
 Cross-browser Testing Platform and Open Source ♥ Provided by [Sauce Labs](https://saucelabs.com).
diff --git a/test/custom-test.js b/test/custom-test.js
index b9c4827..5d63140 100644
--- a/test/custom-test.js
+++ b/test/custom-test.js
@@ -121,7 +121,7 @@ module.exports = function (leveljs, test, testCommon) {
     var db = testCommon.factory()
 
     if (!db.supports.bufferKeys) {
-      t.pass('environment does not support buffer keys')
+      t.fail('environment does not support buffer keys')
       return t.end()
     }
 
@@ -165,7 +165,7 @@ module.exports = function (leveljs, test, testCommon) {
     var db = testCommon.factory()
 
     if (!db.supports.bufferKeys) {
-      t.pass('environment does not support buffer keys')
+      t.fail('environment does not support buffer keys')
       return t.end()
     }
 
@@ -200,7 +200,7 @@ module.exports = function (leveljs, test, testCommon) {
     var db = testCommon.factory()
 
     if (!db.supports.bufferKeys) {
-      t.pass('environment does not support buffer keys')
+      t.fail('environment does not support buffer keys')
       return t.end()
     }
 
diff --git a/test/upgrade-test.js b/test/upgrade-test.js
index c474116..8a15887 100644
--- a/test/upgrade-test.js
+++ b/test/upgrade-test.js
@@ -10,14 +10,14 @@ module.exports = function (leveljs, test, testCommon) {
       { key: -1, value: 'a' },
       { key: '0', value: ab('b') },
       { key: '1', value: 1 },
-      { key: maybeBinary('2'), value: new Uint8Array(ab('2')) }
+      { key: ab('2'), value: new Uint8Array(ab('2')) }
     ]
 
     var output = [
-      { key: maybeBinary('-1'), value: new Uint8Array(ab('a')) },
-      { key: maybeBinary('0'), value: new Uint8Array(ab('b')) },
-      { key: maybeBinary('1'), value: new Uint8Array(ab('1')) },
-      { key: maybeBinary('2'), value: new Uint8Array(ab('2')) }
+      { key: ab('-1'), value: new Uint8Array(ab('a')) },
+      { key: ab('0'), value: new Uint8Array(ab('b')) },
+      { key: ab('1'), value: new Uint8Array(ab('1')) },
+      { key: ab('2'), value: new Uint8Array(ab('2')) }
     ]
 
     db.open(function (err) {
@@ -34,12 +34,7 @@ module.exports = function (leveljs, test, testCommon) {
             t.ifError(err, 'no concat error')
 
             entries.forEach(function (entry) {
-              if (db.supports.bufferKeys) {
-                t.ok(entry.key instanceof ArrayBuffer)
-              } else {
-                t.is(typeof entry.key, 'string')
-              }
-
+              t.ok(entry.key instanceof ArrayBuffer)
               t.ok(entry.value instanceof Uint8Array)
             })
 
@@ -50,10 +45,6 @@ module.exports = function (leveljs, test, testCommon) {
       })
     })
 
-    function maybeBinary (key) {
-      return db.supports.bufferKeys ? ab(key) : String(key)
-    }
-
     function concatRaw (callback) {
       var it = db.iterator()
       it._deserializeKey = it._deserializeValue = identity