vendors/tempy.js/padZeros
    function padZeros(value, tok, options) {
      if (!tok.isPadded) {
        return value;
      }
      let diff = Math.abs(tok.maxLen - String(value).length);
      let relax = options.relaxZeros !== false;
      switch (diff) {
        case 0:
          return "";
        case 1:
          return relax ? "0?" : "0";
        case 2:
          return relax ? "0{0,2}" : "00";
        default: {
          return relax ? `0{0,${diff}}` : `0{${diff}}`;
        }
      }
    }