Extend test suite to int8 and uint8

[liquidcarbon]

Fix for #595

Little something to get going.

There appears to be unused global dtypes which I've extended with np.int8 and np.uint8 and used in the first test.

Tests pass with int8 but not uint8.

Shall I modify the rest of the tests in a similar manner? (will check for nuances and fix formatting)

[ashvardanian]

I'll take it from here, thanks @liquidcarbon!

[ashvardanian]

Hi @liquidcarbon! The issue is coming from the constraints of Python's & NumPy's type-system. There is no separate definition for bit-packs, so I've reserved the u8 values in Python for bit arrays. So your inputs are being treated as individual bits. In SimSIMD, I've addressed it by forcing users to pass an additional dtype-like parameter (like "bin8" for 8-bit packs).

I can perform a similar change in USearch, but it will break the existing behaviour. I'll tag it accordingly and get back to it for v3. Thanks!

[liquidcarbon]

Maybe it's a good idea to steer clear of unsigned ints altogether.