Spec v0.12, section 44.1, already asked for the CID in its canonical form
and an IPv6 literal: a CID with a character more, of zero bits, decoded to
the same bytes and passed, and https://[[2000::]/ passed because checkHost
trimmed every bracket. isCIDv1 refuses 5 or more bits left over, and
checkHost takes one pair of brackets.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>