Implement UArray.contains(element) workaround for JS

generators/builtins/unsignedTypes.kt

@@ -351,7 +351,13 @@ class UnsignedArrayGenerator(val type: UnsignedType, out: PrintWriter) : BuiltIn
         override fun next$elementType() = if (index < array.size) array[index++].to$elementType() else throw NoSuchElementException(index.toString())
     }
 
-    override fun contains(element: $elementType): Boolean = storage.contains(element.to$storageElementType())
+    override fun contains(element: $elementType): Boolean {
+        // TODO: Eliminate this check after KT-30016 gets fixed.
+        // Currently JS BE does not generate special bridge method for this method.
+        if ((element as Any?) !is $elementType) return false
+
+        return storage.contains(element.to$storageElementType())
+    }
 
     override fun containsAll(elements: Collection<$elementType>): Boolean {
         if ((elements as Collection<Any?>).any { it as? $elementType == null }) return false

libraries/stdlib/unsigned/src/kotlin/UByteArray.kt

@@ -37,7 +37,13 @@ internal constructor(@PublishedApi internal val storage: ByteArray) : Collection
         override fun nextUByte() = if (index < array.size) array[index++].toUByte() else throw NoSuchElementException(index.toString())
     }
 
-    override fun contains(element: UByte): Boolean = storage.contains(element.toByte())
+    override fun contains(element: UByte): Boolean {
+        // TODO: Eliminate this check after KT-30016 gets fixed.
+        // Currently JS BE does not generate special bridge method for this method.
+        if ((element as Any?) !is UByte) return false
+
+        return storage.contains(element.toByte())
+    }
 
     override fun containsAll(elements: Collection<UByte>): Boolean {
         if ((elements as Collection<Any?>).any { it as? UByte == null }) return false

libraries/stdlib/unsigned/src/kotlin/UIntArray.kt

@@ -37,7 +37,13 @@ internal constructor(@PublishedApi internal val storage: IntArray) : Collection<
         override fun nextUInt() = if (index < array.size) array[index++].toUInt() else throw NoSuchElementException(index.toString())
     }
 
-    override fun contains(element: UInt): Boolean = storage.contains(element.toInt())
+    override fun contains(element: UInt): Boolean {
+        // TODO: Eliminate this check after KT-30016 gets fixed.
+        // Currently JS BE does not generate special bridge method for this method.
+        if ((element as Any?) !is UInt) return false
+
+        return storage.contains(element.toInt())
+    }
 
     override fun containsAll(elements: Collection<UInt>): Boolean {
         if ((elements as Collection<Any?>).any { it as? UInt == null }) return false

libraries/stdlib/unsigned/src/kotlin/ULongArray.kt

@@ -37,7 +37,13 @@ internal constructor(@PublishedApi internal val storage: LongArray) : Collection
         override fun nextULong() = if (index < array.size) array[index++].toULong() else throw NoSuchElementException(index.toString())
     }
 
-    override fun contains(element: ULong): Boolean = storage.contains(element.toLong())
+    override fun contains(element: ULong): Boolean {
+        // TODO: Eliminate this check after KT-30016 gets fixed.
+        // Currently JS BE does not generate special bridge method for this method.
+        if ((element as Any?) !is ULong) return false
+
+        return storage.contains(element.toLong())
+    }
 
     override fun containsAll(elements: Collection<ULong>): Boolean {
         if ((elements as Collection<Any?>).any { it as? ULong == null }) return false

libraries/stdlib/unsigned/src/kotlin/UShortArray.kt

@@ -37,7 +37,13 @@ internal constructor(@PublishedApi internal val storage: ShortArray) : Collectio
         override fun nextUShort() = if (index < array.size) array[index++].toUShort() else throw NoSuchElementException(index.toString())
     }
 
-    override fun contains(element: UShort): Boolean = storage.contains(element.toShort())
+    override fun contains(element: UShort): Boolean {
+        // TODO: Eliminate this check after KT-30016 gets fixed.
+        // Currently JS BE does not generate special bridge method for this method.
+        if ((element as Any?) !is UShort) return false
+
+        return storage.contains(element.toShort())
+    }
 
     override fun containsAll(elements: Collection<UShort>): Boolean {
         if ((elements as Collection<Any?>).any { it as? UShort == null }) return false