[Numpy-discussion] Converting np.sinc into a ufunc

[Sebastian Berg]

Hi all,

there is an open PR (https://github.com/numpy/numpy/pull/12924) to
convert `np.sinc` into a ufunc. Since it should improve general
precision in `np.sinc`, I thought we could try to move that forward a
bit. We check whether this is worth it or not in the end.

However, it would also change behaviour slightly since `np.sinc(x=arr)`
will not work, as ufuncs are positional arguments only (we could wrap
`sinc`, but that hides all the nice features). Otherwise, there should
be no change except additional features of ufuncs and the move to a C
implementation.

This is mostly to see if anyone is worried about possible slight API
change here.

All the Best,

Sebastian
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