function copyArgArray(gd, args) {
    var copy = [];
    var arg;

    for(var i = 0; i < args.length; i++) {
        arg = args[i];

        if(arg === gd) copy[i] = arg;
        else if(typeof arg === 'object') {
            copy[i] = Array.isArray(arg) ?
                Lib.extendDeep([], arg) :
                Lib.extendDeepAll({}, arg);
        } else copy[i] = arg;
    }

    return copy;
}
Copy arg array *without* removing `undefined` values from objects.

@param gd
@param args
@returns {Array}