Stream.filterIsInstance has wrong return type #KT-5097 Fixed

libraries/stdlib/src/generated/_SpecialJVM.kt

@@ -341,8 +341,8 @@ public fun <T, R : T> Iterable<T>.filterIsInstance(klass: Class<R>): List<R> {
 /**
  * Returns a stream containing all elements that are instances of specified class
  */
-public fun <T, R : T> Stream<T>.filterIsInstance(klass: Class<R>): Stream<T> {
+public fun <T, R : T> Stream<T>.filterIsInstance(klass: Class<R>): Stream<R> {
-    return FilteringStream(this, true, { klass.isInstance(it) })
+    return FilteringStream(this, true, { klass.isInstance(it) }) as Stream<R>
 }
 
 /**

libraries/tools/kotlin-stdlib-gen/src/templates/SpecialJVM.kt

@@ -99,10 +99,10 @@ fun specialJVM(): List<GenericFunction> {
         exclude(ArraysOfPrimitives, Strings)
 
         doc(Streams) { "Returns a stream containing all elements that are instances of specified class" }
-        returns(Streams) { "Stream<T>" }
+        returns(Streams) { "Stream<R>" }
         body(Streams) {
             """
-            return FilteringStream(this, true, { klass.isInstance(it) })
+            return FilteringStream(this, true, { klass.isInstance(it) }) as Stream<R>
             """
         }
     }