Fixed PHP 8.1 deprecation by adding \ReturnTypeWillChange annotation in InternalPriorityQueue. (#212)
Fixed PHP 8.1 deprecation by adding \ReturnTypeWillChange annotation in InternalPriorityQueue. (#212)

Co-authored-by: Bart Vanhoutte <8ed42d1af688a3d9c9e997582f65d4c033bf6e7b@groupflights.com>
ReactiveX/RxPHP