Bad syntax in crypto.digests
Breaks Python 2.6: https://foss.heptapod.net/python-libs/passlib/-/commit/db4beabafe1b3801c0003f71e921db742e54fa83#4161dcb671af11575670e90b8f8658e3395b557a_99_124 ```python ... sorted(hashlib.algorithms_available | {"md4"}) ``` `|` cannot be used to short-circuit to set a default. The result is a syntax error.
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