David Cuthbert <da...@kanga.org> added the comment:

FreeBSD 12.1 and MacOS 10.15.1 (Catalina) appear to have saner and safer 
behavior.

Both require the use of SO_REUSEPORT for this behavior to happen as well. 
FreeBSD also requires the UID to be the same or 0 for subsequent processes to 
make the bind() call. I'll call this out as being Linux-specific in the 
deprecation message for now. (I don't have an AIX, HP-UX, or Solaris system 
handy to test, nor do I really want one if I'm being honest. :-) .)

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<https://bugs.python.org/issue37228>
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