Fix wrong type in 2 part path get

docs/globals.html

@@ -1698,7 +1698,7 @@ <h4>T</h4>
 									<h4>K1<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">keyof T</span></h4>
 								</li>
 								<li>
-									<h4>K2<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">keyof T[K1]</span></h4>
+									<h4>K2<span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">keyof U&lt;T[K1]&gt;</span></h4>
 								</li>
 							</ul>
 							<h4 class="tsd-parameters-title">Parameters</h4>

src/lib/get.ts

@@ -191,7 +191,7 @@ export function get<T, K1 extends keyof T>(
  * @returns the nested value in the source. Value returned is the reference of the value in source.
  * Modifying this value will also modify the source value.
  */
-export function get<T, K1 extends keyof T, K2 extends keyof T[K1]>(
+export function get<T, K1 extends keyof T, K2 extends keyof U<T[K1]>>(
   source: Optional<T>,
   path: [K1, K2],
 ): U<T[K1]>[K2] | undefined

src/test/get.test.ts

@@ -89,4 +89,13 @@ describe('get', () => {
     expect(get({ a: { b: false } }, ['a', 'b'], true)).toBe(false)
     expect(get({ a: { b: null } } as any, ['a', 'b'], true)).toBe(null)
   })
+
+  test('is working correctly for undefinable get with 2 elements', () => {
+    interface A {
+      [key: string]: { a: number } | undefined
+    }
+
+    // the test is testing the typings of the get method
+    expect(get({} as A, ['k1', 'a'])).toBe(undefined)
+  })
 })