Jaraco.collections

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Revised ``DictFilter``:

- Fixed issue where ``DictFilter.__contains__`` would raise a ``KeyError``.
- Relies heavily now on ``collections.abc.Mapping`` base class.

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Packaging refresh.

Enrolled with Tidelift.

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Fixed ``DictStack.__len__`` and addressed recursion error on
PyPy in ``__getitem__``.

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``DictStack`` now supports the following Mapping behaviors:

- ``.items()``
- casting to a dict
- ``__contains__`` (i.e. "x in stack")

Require Python 3.7 or later.

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Add ``WeightedLookup``.

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Add ``FreezableDefaultDict``.