Use Promise v3 template types

Author: clue

README.md

@@ -47,7 +47,7 @@ Timer\timeout(…);
 
 ### timeout()
 
-The `timeout(PromiseInterface<mixed> $promise, float $time, ?LoopInterface $loop = null): PromiseInterface<mixed>` function can be used to
+The `timeout(PromiseInterface<T> $promise, float $time, ?LoopInterface $loop = null): PromiseInterface<T>` function can be used to
 cancel operations that take *too long*.
 
 You need to pass in an input `$promise` that represents a pending operation
@@ -239,7 +239,7 @@ $timer->cancel();
 
 > Deprecated since v1.8.0, see [`sleep()`](#sleep) instead.
 
-The `reject(float $time, ?LoopInterface $loop = null): PromiseInterface<void>` function can be used to
+The `reject(float $time, ?LoopInterface $loop = null): PromiseInterface<never>` function can be used to
 create a new promise which rejects in `$time` seconds with a `TimeoutException`.
 
 ```php

src/functions.php

@@ -129,10 +129,11 @@
  * For more details on the promise primitives, please refer to the
  * [Promise documentation](https://github.com/reactphp/promise#functions).
  *
- * @param PromiseInterface<mixed> $promise
+ * @template T
+ * @param PromiseInterface<T> $promise
  * @param float $time
  * @param ?LoopInterface $loop
- * @return PromiseInterface<mixed>
+ * @return PromiseInterface<T>
  */
 function timeout(PromiseInterface $promise, $time, LoopInterface $loop = null)
 {
@@ -318,7 +319,7 @@ function resolve($time, LoopInterface $loop = null)
  *
  * @param float         $time
  * @param LoopInterface $loop
- * @return PromiseInterface<void>
+ * @return PromiseInterface<never>
  * @deprecated 1.8.0 See `sleep()` instead
  * @see sleep()
  */