copyWithZone method
copyWithZone:
Implementation
objc.ObjCObject copyWithZone(ffi.Pointer<NSZone> zone) {
final $ret = _objc_msgSend_1cwp428(
object$.ref.pointer,
_sel_copyWithZone_,
zone,
);
return objc.ObjCObject($ret, retain: false, release: true);
}