Pydash

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- Support matches-style callbacks on non-dictionary objects that are compatible with ``pydash.get`` in functions like ``pydash.find``.

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- Fix compatibility issue between ``pydash.py_`` / ``pydash._`` and ``typing.Protocol`` + ``typing.runtime_checkable`` that caused an exception to be raised for ``isinstance(py_, SomeRuntimeCheckableProtocol)``.

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- Fix bug in ``merge_with`` that prevented custom iteratee from being used when recursively merging. Thanks weineel_!

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- Drop support for Python 2.7. (**breaking change**)
- Improve Unicode word splitting in string functions to be inline with Lodash. Thanks mervynlee94_! (**breaking change**)

- ``camel_case``
- ``human_case``
- ``kebab_case``
- ``lower_case``
- ``pascal_case``
- ``separator_case``
- ``slugify``
- ``snake_case``
- ``start_case``
- ``upper_case``

- Optimize regular expression constants used in ``pydash.strings`` by pre-compiling them to regular expression pattern objects.

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- Fix regression introduced in ``v4.8.0`` that caused ``merge`` and ``merge_with`` to raise an exception when passing ``None`` as the first argument.

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- Fix regression introduced in ``v4.9.1`` that broke ``pydash.get`` for dictionaries and dot-delimited keys that reference integer dict-keys.