micha91

fix: Fix multipart body file array

3

As described in #692 arrays of files are not handled correctly, if they are part of multipart/form-data. This is fixed in this PR by letting `to_multipart` return a `List[Tuple[str, Any]]`...

**Bug Report** If I define an abstract method in a base class with generic parameters and one specific parameter, I cannot have a subclass implementing this method with specific parameters...