Hi all,
Using `np.ndenumerate` on masked arrays gives unexpected results. For instance,
next(np.ndenumerate(np.ma.masked_all(())))
does *not* equal `((), np.ma.masked)`, but instead contains whatever
value happens to be in the uninitialized data part of the masked
array.
Even better than yielding `((), np.ma.masked)` would be for
`ndenumerate` to skip masked entries altogether. After all, we are
also getting the index of the entries we are iterating over.
I went ahead and implemented this specialization of `ndenumerate` for
masked arrays: https://github.com/numpy/numpy/pull/20020
If there is anything I can do to advance this pull request, please let me know.
Regards,
- Jouke
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