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Summary
Following discussion, I'm splitting #8187 by module.
Details and comments
The first two appear to be some kind of mypy problem: it can't distinguish between function and same named module due to import structure?
The next some are due to the fact that
Backend
class do not define any attributes, but rather its subclasses do. Finally, some errors are due to type cast mypy misses -- can be solved by explicit cast or changing variable name probably?