Strict typing with pyright fails due to use of Unknown

[MaffooBristol]

This is in multiple places, but the uses of types such as Dict cause PyRight with strictTypingMode=True to complain about the use of Unknowns

For example jpegopt from convert_to_path() defines its type as:

jpegopt: Dict = None,

But it should be somewhat stricter, as just:

jpegopt: Dict[str, Any] = None,

Equally, for size:

size: Union[Tuple, int] = None,

Would become:

size: Union[Tuple[Optional[int], Optional[int]], int] = None,

I think this should be a fairly simple change to make but wondering whether it's something worth making a PR for – if so I can do that and link it to this issue.

Thanks!