xarray ufuncs

[keewis]

The documentation warns that the universal functions in xarray.ufuncs should not be used unless compatibility with numpy < 1.13 is required.

Since we only support numpy >= 1.15: is it time to remove that (already deprecated) module?

Since there are also functions that are not true ufuncs (e.g. np.angle and np.median) and need __array_function__ (or something similar, see #3917), we could also keep those and just remove the ones that are dispatched using __array_ufunc__.

[dcherian]

Sounds good to me

[keewis]

which suggestion do you mean? Removing the whole module or just the __array_ufunc__ functions?

[keewis]

actually, it seems we might need to wait a bit longer, the deprecation warning says we would remove the __array_function__ ufuncs only after we stopped supporting numpy < 1.17 (see #2615 where the warning was extended). That means we still could remove only a part of the module, or we could wait until we could remove the whole module. I think we should put that warning (removed after support for 1.17 is dropped) into the documentation, too.

[dcherian]

I think we should put that warning (removed after support for 1.17 is dropped) into the documentation, too.

👍

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