`resize.Crop` actually hasn't been moved to `crop.Crop` (as the removed
class claimed). In fact, what used to be called `resize.Crop` is now
`resize.Fill`. The confusion is understandable, since it's what
motivated the change in the first place!
Crop doesn't necessarily imply the any scaling is taking place. Several
ideas were discussed, from renaming Crop to combining both processors
into a single Resize processor (as they were in the original IK), but
those solutions were felt to either precluded future extension
(alternative resize modes) or make the API too verbose.
