Haxe JS cast()

js.Boot.__interfLoop = function(cc,cl) {
    if(cc == null) return false;
    if(cc == cl) return true;
    var intf = cc.__interfaces__;
    if(intf != null) {
        var _g1 = 0, _g = intf.length;
        while(_g1 < _g) {
            var i = _g1++;
            var i1 = intf[i];
            if(i1 == cl || js.Boot.__interfLoop(i1,cl)) return true;
        }
    }
    return js.Boot.__interfLoop(cc.__super__,cl);
}
js.Boot.__instanceof = function(o,cl) {
    if(cl == null) return false;
    switch(cl) {
    case Int:
        return (o|0) === o;
    case Float:
        return typeof(o) == "number";
    case Bool:
        return typeof(o) == "boolean";
    case String:
        return typeof(o) == "string";
    case Dynamic:
        return true;
    default:
        if(o != null) {
            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;
            }
        } else return false;
        if(cl == Class && o.__name__ != null) return true;
        if(cl == Enum && o.__ename__ != null) return true;
        return o.__enum__ == cl;
    }
}
js.Boot.__cast = function(o,t) {
    if(js.Boot.__instanceof(o,t)) return o; else throw "Cannot cast " + Std.string(o) + " to " + Std.string(t);
}