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Type: Bug
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Resolution: Fixed
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Priority: Unknown
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Affects Version/s: None
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Component/s: None
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None
`_DocumentIn` doesn't have to be a MutableMapping – documents can just be a `Mapping`.
Since `_Documentin` is `Union[MutableMapping, RawBSONDocument]`, and `RawBSONDocument` inherits from Mapping, we can get rid of this type alias.