code: function toknam(code) {
    var keys = Object.keys(C);
    for (var i = 0, l = keys.length; i < l; i++) {
      var key = keys[i];
      if (C[key] === code) { return key; }
    }
    return code && ("0x" + code.toString(16));
  }
docs: Slow code to string converter (only used when throwing syntax errors)