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- Fixed a rare thread safety issue when the size of PoolManager is inferior to the thread count. An edge case permitted
the creation of two ``ConnectionPool`` for the same ``PoolKey``.
- Changed the default behavior of threads management to not raise an exception if the thread count is greater than
the pool size. Making it that way better align with upstream, our initial decision revealed itself to cause
confusions for some of our users. No longer will urllib3-future raise ``OverwhelmedTraffic`` in default configuration.
- Fixed an error when ``happy_eyeballs=True`` is set with more tasks or threads than the pool size.