The limit is checked before the new connection is added to the set, so
with --connections-max=N and N connections open "set_size() > N" is
false and an additional connection is admitted. Use ">=" to refuse new
connections once the limit is reached.
(cherry picked from commit 9b51efd69fade39b0315251d02d1c9eab929891c)
Kamil Monicz
f3d4d3e25a