docs: function _onMDPasteBefore(cm, {source, data: eventData}) {
    if (!_isFromCodeBlockInCodeMirror(cm, source, eventData)) {
      return;
    }
  
    const code = eventData.text.join('\n');
    const delta = calcDSVDelta(code, '\t');
  
    if (delta === 0) {
      csv.COLUMN_SEPARATOR = '\t';
      const parsed = _reduceToTSV(csv.parse(code));
      eventData.update(eventData.from, eventData.to, parsed);
    }
  }