Proposed new feature or change:

There is a good tutorial for writing ufuncs in C here: https://numpy.org/doc/stable/user/c-info.ufunc-tutorial.html. It would be wonderful if there was something similar for regular functions. I wouldn't have to bug devs so much if it existed.

Some specific questions that I'd like to have authoritative answers for:

• How to harness the code generation machinery to generate multiple loops.
• How to dispatch to those loops correctly.
• How to unpack arguments from the python code in preparation for the dispatcher.
• All the different layers of python and C wrappers and where they go in the numpy codebase.
• Where to put docstrings.

Actual usecase #1: I wrote a ufunc based on the tutorial: https://github.com/madphysicist/is_integer_ufunc. Now I want to add some arguments, but since ufuncs can't accept arbitrary arguments, I have to turn my ufunc into an ordinary function, but with multiple loops.

Actual usecase #2: I'd like to write up an O(n) version of weighted partitioning/quantiles. This will look something similar to sort, which is a regular function.