code: function _finishRecording() {
          if (_recordedSequenceCallback) {
              _normalizeSequence(_recordedSequence);
              _recordedSequenceCallback(_recordedSequence);
          }
  
          // reset all recorded state
          _recordedSequence = [];
          _recordedSequenceCallback = null;
          _currentRecordedKeys = [];
      }
docs: finishes the current recording, passes the recorded sequence to the stored
  callback, and sets Mousetrap.handleKey back to its original function
  
  @returns void