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Fixes #672
The kind of change this PR does introduce
Current behaviour
clientsCount
is private which it shouldn't be as it is explicitly mentioned as something you can use in both the README:engine.io/README.md
Line 245 in 535b068
and the website: https://socket.io/docs/v4/server-instance/#serverengine
New behaviour
clientsCount
is public.Other information (e.g. related issues)