LUSERS out of sync yet again

[slingamn]

On a server running 4336f56:

>> @time=2020-10-15T03:20:12.819Z :[redacted] 251 shivaram :There are 146 users and -91 invisible on 1 server(s)
>> @time=2020-10-15T03:20:12.819Z :[redacted] 252 shivaram 1 :IRC Operators online
>> @time=2020-10-15T03:20:12.819Z :[redacted] 253 shivaram 0 :unregistered connections
>> @time=2020-10-15T03:20:12.819Z :[redacted] 254 shivaram 25 :channels formed
>> @time=2020-10-15T03:20:12.819Z :[redacted] 255 shivaram :I have 55 clients and 0 servers
>> @time=2020-10-15T03:20:12.819Z :[redacted] 265 shivaram 55 58 :Current local users 55, max 58
>> @time=2020-10-15T03:20:12.819Z :[redacted] 266 shivaram 55 58 :Current global users 55, max 58

[slingamn]

I think this may be associated with always-on users with the +i mode? Maybe when they add and remove a single session?

[slingamn]

This affects ordinary, anonymous users when +i is a default usermode. It seems to be a bad interaction between #1079 and #1303. This code is impossible to get right :-(