[Numpy-discussion] ENH: Adding a count parameter to np.unpackbits

[Joseph Fox-Rabinovitz]

Hi,

I have added PR #10855 to allow unpackbits to unpack less than the entire
set of bits. This is not a very big change, and 100% backwards compatible.
It serves two purposes:

1. To make packbits and unpackbits completely invertible (and
prevent things like this from being necessary:
https://stackoverflow.com/a/44962805/2988730)
2. To prevent an unnecessary waste of space for large arrays that are
unpacked along a single dimension.

Regards,

- Joe
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