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Thanks for the PR, but we should add a NEWS entry as well as a.. versionchanged:: next in the rst docs of TCPServer.

Okay, i this change looks right for what was described in the issue. BUT i've done a little more research to double check the implications. we may not want to use0 even though that felt right. apparently some platforms treat that as actual 0, effectively disabling connections. posix doesn't seem torequire 0 to mean "default". ugh.

In particular Linux -https://bugzilla.kernel.org/show_bug.cgi?id=119141

a better alternative effectively similar to what the intent of 0 was is probably something like:

getattr(socket, "SOMAXCONN", 5) to use socket.SOMAXCONN if defined otherwise our old non-zero default.