function asciiControl(code) {
  return (
    // Special whitespace codes (which have negative values), C0 and Control
    // character DEL
    code !== null && (code < codes.space || code === codes.del)
  )
}
Check whether a character code is an ASCII control character.

An **ASCII control** is a character in the inclusive range U+0000 NULL (NUL)
to U+001F (US), or U+007F (DEL).

@param {Code} code
  Code.
@returns {boolean}
  Whether it matches.