Typeit

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* Fix bug in parsing union types with sequence variants.
* Primitive types switched to strict matching.
* Non-strict primitives flag `NonStrictPrimitives` is available for overrides.
* Added support for `typing.Mapping`
* Added support for `pathlib.Path`

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* Dependencies were split into minimal / extras.

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* `utils.iter_invalid_data()` does not throws KeyError when sample value is missing.

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* Added a utility function for iterating over invalid data samples.

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* Internal dependencies updated.

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* Fixed bug in Union serialization.