While using the C API to work with Numpy arrays, I came across some inconsistencies regarding the return of a success state from various Numpy functions. For example, the array iterator functions return either NPY_SUCCEED (defined as 1) or NPY_FAIL (defined as 0) to indicate whether the function successfully finished. However, various of the array functions return -1 on success and 0 on failure. The result is similar enough, but I would think it more consistent to use NPY_SUCCEED/NPY_FAIL everywhere. As an example, consider the documentation pages for the Array API: https://numpy.org/doc/stable/reference/c-api/array.html and the Array iterator API: https://numpy.org/doc/stable/reference/c-api/iterator.html#array-iterator-ap... I hope this is the right place to place this. It is the first time I really publicly engage with this kind of thing. This did not seem like a bug and the Github page indicated that feature requests should go to the mailing list first.