Fix UArray.containsAll(Collection<Any?>)

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

@@ -39,7 +39,10 @@ internal constructor(@PublishedApi internal val storage: ByteArray) : Collection
 
     override fun contains(element: UByte): Boolean = storage.contains(element.toByte())
 
-    override fun containsAll(elements: Collection<UByte>): Boolean = elements.all { storage.contains(it.toByte()) }
+    override fun containsAll(elements: Collection<UByte>): Boolean {
+        if ((elements as Collection<Any?>).any { it as? UByte == null }) return false
+        return elements.all { storage.contains(it.toByte()) }
+    }
 
     override fun isEmpty(): Boolean = this.storage.size == 0
 }