Number.isInt = function isInt(n) { return Number(n) === n && n % 1 === 0; };
Number.isInteger = Number.isInteger || Number.isInt;
Number.prototype.toKUser = function() {
    let num = parseInt(this);
    if (Number.isInteger(num)) {
        let user = KnuddelsServer.getUserAccess().getUserById(num);
        return (user !== null) ? user : undefined;
    }
};
String.prototype.toKUser = function() {
    let nick = this.trim(),userAccess = KnuddelsServer.getUserAccess();
    return (userAccess.exists(nick)) ? userAccess.getUserById(userAccess.getUserId(nick)) : undefined;
};