Available on python
@:optionaloptionalstrict:Null<Bool>
@:optionaloptionalparse_int:Null<String ‑> Int>
@:optionaloptionalparse_float:Null<String ‑> Float>
@:optionaloptionalparse_constant:Null<String ‑> Dynamic>
@:optionaloptionalobject_pairs_hook:Null<Array<Tuple2<String, String>> ‑> Dict<String, Dynamic>>
@:optionaloptionalobject_hook:Null<Dict<String, Dynamic> ‑> Dynamic>