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Document `numba` sparse plugin types

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Assessment

Difficulty
1/5
Estimated time
1-3 hours
Newbie friendliness
74/100
Issue type
Documentation
Clarity
Mostly clear
Activity status
Quiet
Tech stack
python
Domain
documentation

Research direction

Start with the linked typing documentation page and review how existing types are described. Document the sparse plugin types, including the CSBase annotation example inside an @njit function, so users can find and understand this usage in the docs.

Written by the indexing model from the issue text.

Description

I don't see this in the docs at the moment? Even just a note in typing or something. Like doing

@njit
def my_op(
    mat: CSBase
    ....
)

should be documented, right?

Dominant language
Python
Stars
15
Forks
5
Avg merge
10h 24m
Merged PRs (30d)
12

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