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Because if we have a send event to signal the connection sucess + a recv
event to signal something to read on the socket, we need to first finish the
connect process before reading the available data. That’s what we do now.

I think it was a UB

fix #3157

ref #3152

The unit file Type=, as well as the executable path should now be correct
with a simple “make install”, whatever the install prefix and the DESTDIR
values are.

ref #3152

fix #3151

See http://ircv3.net/specs/extensions/multi-prefix-3.1.html
ref #3103

Include encodingIn and encodingOut options, unused at the moment

And a way to retrieve its values, defaulting on the ServerOptions for unset
values.

In Bridge and IrcClient

fix #3145