code: function getStrConverter(format, utfType)
  {
      return function(str, existingBin, existingBinLen) {
          return str2binb(str, utfType, existingBin, existingBinLen);
      };
  }
docs: Function that takes an input format and UTF encoding and returns the
  appropriate function used to convert the input.
  
  @private
  @param {string} format The format of the string to be converted
  @param {string} utfType The string encoding to use (UTF8, UTF16BE,
  UTF16LE)
  @return {function(string, Array.<number>=, number=): {value :
  Array.<number>, binLen : number}} Function that will convert an input
  string to a packed int array