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Make StorageInterface a Protocol.

vlorentz requested to merge generated-differential-D3855-source into generated-differential-D3855-target

We're already using 'StorageInterface' as type annotation where we expect an object that implements the same methods, but it isn't technically correct since these objects aren't an instance of a subclass.

Making StorageInterface a protocol reflects how we already use it, without lying to mypy.

Migrated from D3855 (view on Phabricator)

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