py-pyrsistent: updated to 0.15.4
0.15.4:
* Fix a GC traversal bug in pvector evolver C extension.
* Fix pytest 5 compatibility, this is a quick fix, some more work is needed to get coverage working etc.
0.15.3:
* Fix catch all exceptions during extension build to reduce chance of corner cases that prevents installation.
* Fix in PVector equality comparison don's assume that other object has a length, check before calling len.
* Fix write warning about failing build of C extension directly to stderr to avoid that pip silences it.
* Fix update PMapEvolver type stub to better reflect implementation.
0.15.2:
* Propagate 'ignore_extra' param in hierarchy.
* Fix thaw typing.
* Fix not possible to insert empty pmap as leaf node with transform.
0.15.1:
* Fix installation broken on Python 2.
0.15.0:
* Python 3.4 is no longer officially supported since it is EOL since 2019-03-18.
* Fix major improvements to type hints.
* Fix installation fails on some Windows platforms because fallback to Python pvector does not work.
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