Kotlin 2.3 migration: Remove useless cast

Author: tbogdanova

kotlinx-coroutines-core/common/src/channels/BufferedChannel.kt

@@ -764,7 +764,7 @@ internal open class BufferedChannel<E>(
         index: Int,
         r: Long
     ) = suspendCancellableCoroutineReusable { cont ->
-        val waiter = ReceiveCatching(cont as CancellableContinuationImpl<ChannelResult<E>>)
+        val waiter = ReceiveCatching(cont)
         receiveImplOnNoWaiter(
             segment, index, r,
             waiter = waiter,

kotlinx-coroutines-core/common/src/flow/operators/Transform.kt

@@ -126,7 +126,7 @@ public fun <T> Flow<T>.runningReduce(operation: suspend (accumulator: T, value:
         } else {
             operation(accumulator as T, value)
         }
-        emit(accumulator as T)
+        emit(accumulator)
     }
 }
 

kotlinx-coroutines-core/js/src/Promise.kt

@@ -63,5 +63,5 @@ public fun <T> Promise<T>.asDeferred(): Deferred<T> {
 public suspend fun <T> Promise<T>.await(): T = suspendCancellableCoroutine { cont: CancellableContinuation<T> ->
     this@await.then(
         onFulfilled = { cont.resume(it) },
-        onRejected = { cont.resumeWithException(it as? Throwable ?: Exception("Non-Kotlin exception $it")) })
+        onRejected = { cont.resumeWithException(it) })
 }

kotlinx-coroutines-core/jvm/src/internal/StackTraceRecovery.kt

@@ -180,7 +180,7 @@ private fun createStackTrace(continuation: CoroutineStackFrame): ArrayDeque<Stac
 
     var last = continuation
     while (true) {
-        last = (last as? CoroutineStackFrame)?.callerFrame ?: break
+        last = last.callerFrame ?: break
         last.getStackTraceElement()?.let { stack.add(it) }
     }
     return stack