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Features
* Support for Unit objects from `pint`.
* Support for classes with underlying `__slots__` objects.
* Support for classes that utilize `to_json()` and `from_json()`.
* Metadata arguments can be marked to be ignored when snapshotting.
Bug-Fixes
* Objects with `from_json()` are properly instantiated when comparing snapshots
* Objects of type `float` and `float64` are now properly compared
* Iterable objects and `numpy` iterable objects are now properly compared