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Description
So that we can setup mypy on CI we need to elliminate all errors. Currently all serious mypy errors are in canmatrix.canmatrix and most of them are bound to float_factory playing with attrs.
The problem is, that mypy currently only undertsand attr converters, if they are named functions. That means NEITHER converter=decimal.Decimal NOR converter=CanId.from_compound_integer.
Hopefully we could add named 'helper' function (say convert_to_float(x: Any) -> Any)to satisfy mypy, but the question is - do every Signal needs its own converter? Wouldn't be single module-level converter enough?