assertByteArray = (arr, optNameOfArray = 'Alleged byteArray') => {
  const passStyle = passStyleOf(arr);
  passStyle === 'byteArray' ||
    Fail`${q(
      optNameOfArray,
    )} ${arr} must be a pass-by-copy binary data, not ${q(passStyle)}`;
}
@param {Passable} arr
@param {string=} optNameOfArray
@returns {asserts arr is ByteArray}