code: function append(name, value) {
      validateArgumentsLength(arguments.length, 2);
      var state = getInternalParamsState(this);
      state.entries.push({ key: name + '', value: value + '' });
      if (state.updateURL) state.updateURL();
    }
docs: `URLSearchParams.prototype.appent` method https://url.spec.whatwg.org/#dom-urlsearchparams-append