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note that this explicitly doesn't handle changes in the server's
casefolding settings, or migrations from old "seen" databases to the new
casefolding version.

maybe in the future the casefolding setting can be saved in the database
and then re-folded on startup, but idgaf rn

why does nothing I change ever get committed?

Eventually we will also use irc_tolower() for channel names and nicks
where appropriate as well.

makes it more readable instead of repeating irc_say(irc_channel, msg)
all the time

rename %say to %tell to match the function name