"There is no error reply for bad channel names."
-- https://datatracker.ietf.org/doc/html/rfc1459#section-4.2.5
-- https://datatracker.ietf.org/doc/html/rfc2812#section-3.2.5
"If the channel name is invalid or the channel does not exist,
one RPL_ENDOFNAMES numeric containing the given channel name
should be returned."
-- https://modern.ircdocs.horse/#names-message