Haxe javascript instanceof improvement.

instanceof.js

js.Boot.__instanceof = function(o,cl) {
  if (o === null || cl === null) return false;
	if (typeof cl === 'function') {
		if(o instanceof cl) {
			if(cl == Array) return o.__enum__ == null;
			return true;
		}
		if(js.Boot.__interfLoop(o.__class__,cl)) return true;
	}
	switch(cl) {
	case Int:
		return Math.ceil(o%2147483648.0) === o;
	case Float:
		return typeof(o) == "number";
	case Bool:
		return o === true || o === false;
	case String:
		return typeof(o) == "string";
	case Dynamic:
		return true;
	default:
		if(o == null) return false;
		if(cl == Class && o.__name__ != null) return true; else null;
		if(cl == Enum && o.__ename__ != null) return true; else null;
		return o.__enum__ == cl;
	}
}