The tests are failing, but the package appears to be generally broken for
python 3.9 and above on Darwin.
Co-authored-by: Jonathan Ringer <jonringer@users.noreply.github.com>
Socket.IO and Engine.IO protocols are not backwards-compatible and major
versions of the client and server need to be coordinated. It's therefore useful
to have python-engineio 3.x available for use with python-socketio 4.x.