Always interpret provided shapes as int. Add a note on using output_shape for color images.
Add unit test to catch non-integer output shape bug
FEAT: Shared function for safe int casting
Convert name to _safe_as_int, output np.int64, expand Examples
Merge pull request #8 from JDWarner/safe_int_casting

Add safe int casting utility function
Use safe_as_int to check provided output shape
Move safe_as_int into utils
Merge pull request #992 from stefanv/warp_safe_output_shape

Safely handle non-integer output shape specification