Adding 'strictly' to make the conditions to be met by the `xp` argument even more clear.
Following the suggestion in https://github.com/numpy/numpy/issues/10448#issuecomment-468302058 .

ENH: Adding a count parameter to np.unpackbits

ENH: Correct handling of infinities in np.interp (option B)

Tests are included.

Couple of minor fixes:
- Fixed packbits/unpackbits docs to reflect proper keyword names
- Added .pytest_cache to .gitignore

Alternative to gh-12978, using a method that does not need a lot of special cases.
This is likely more robust in the face of overflow

Fixes gh-12951.

The pickle module was being imported from numpy.core.numeric. It was
defined there in order to use pickle5 when available in Python3 and
cpickle in Python2. The numpy.compat module seems a better place for
that.

DOC: Properly format Return section of ogrid Docstring,

* TST: Move test for negative stat_length

and extend coverage to all modes and more variations of a negative
stat_length.

* TST: Merge tests for pad_width in single class

* TST: Test behavior of pad's kwargs for all modes

* TST: Move test to TestReflect

Can be grouped with already existing test class checking the behavior
for the reflect mode.

* TST: Simplify regression test for object input

* TST: Move testing pad_width as ndarray

Can be grouped in class TestPadWidth as this test checks if an ndarray
is accepted as the value to pad_width

* TST: Remove faulty tests for pad_width's type

These test were ineffective. The TypeError raised in these test was not
actually due to pad_width receiving the wrong type but due to the
missing parameter mode.

Added missing type complex to the appropriate existing test checking for
pad_widths type behavior.

* TST: Move test for pad_width of zero

* TST: Move test for simple stat_length

* TST: Simplify classes with only one test

* TST: Add naive test for non-contiguous arrays

* MAINT: Don't import pad directly

Using np.pad instead of directly importing the function seems to be more
inline with other test modules.

* STY: Make class layout consistent in module

* TST: Fix match-string for missing pad mode error

The CLI fails due to error message containing a reference to
_pad_dispatcher() being returned instead of pad(). For some reason this
test passes when run locally.