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https://zeromq.jira.com/browse/LIBZMQ-153 - here's official bug report.
I used a rather dirty way of getting a free port instead of
TCP::Test::empty_port()
as I didn't want to introduce a dependency onTCP::Test
if it's not really needed. And I didn't want to make code much more complicated either.So now we have a clear improvement on Windows (it kind of works instead of total failure), and on Unix the code didn't change.