I've been looking at applying typing to some code which uses PIL/pillow.

Is there any feeling regarding the addition of type annotations within Pillow, or if these belong outside the code in eg. typeshed? This influences whether I might work on a PR against Pillow itself, or generate stubs for typeshed.

On the basis of supporting python 2 and 3, I expect annotations would be in comments, and there would be an import of the typing module near the top, to define required types.