code: function _expandUnicodeEscapes(s) {
    return s.replace(/\\([0-9a-f]{1,6})\s/gi, function() {
      let code = arguments[1],
        repeat = 6 - code.length;
      while (repeat--) {
        code = '0' + code;
      }
      return '\\' + code;
    });
  }
docs: conversion of sort unicode escapes with spaces like `\33 ` (and longer) into
  expanded form that doesn't require trailing space `\000033`
  @param {string} s
  @return {string}