* Import `webencodings` to use `Encoding` class instead of `Protocol`
* Make `_inputstream.BufferedStream`, `filters.base.Filter`, `_utils.MethodDispatcher` generic
* Fix incorrect types in `_ihatexml.pyi`
* Add types for some attributes/methods
If you're reading about this commit from an autogenerated changelog entry, this should have no user-visible impact on how the stubs are interpreted by a type checker; it's just an internal change to how typeshed's tests work.
