Hi Nibabel community,

Great job on getting some type checking into this package! I wanted to point out two scenarios that I use frequently that have run me into type checking issues based on 5.1.0.

1. nb.load shows a return type of FileBasedImage. This is all well and good, but unfortunately FileBasedImage does not define get_fdata(). A common code example that I use (and see around) is:

obj = nb.load(filepath)
data = obj.get_fdata()

2. nb.Nifti1Image doesn't want to take None for the affine. I previously saw this code used frequently:

nb.Nifti1Image(data_array, None, header)

Just bringing these to your attention. I'm also flexible to change up my code, if better patterns are recommended.