from decimal import Decimal never suggested for Decimal

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I assume this is because it's a C module and therefore there's no source to scan. I'm opening this on .el rather than the Python library because the Python library has a way to add import statements but it's not clear to me what the "right" way to inject those into the relevant process is.

[ryanprior]

Hello @glyph thank you for your report! 🚨

I just reproduced this and will look into it more. Are you interested in contributing a fix?

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I am fairly full up on work right now, sorry to say! And I don't have a lot of experience contributing to elisp projects, despite having written embarrassing amounts of elisp code in my life. If I did have time, do you have a guide for how to install importmagic.el from a git checkout and how to run tests or otherwise set up one's environment to contribute?

[ryanprior]

I understand time is scarce. If you do find time and motivation, it would be wonderful to have your contribution!

There is a tiny guide here: https://github.com/anachronic/importmagic.el#contributing
I would do well to expand on it some. To answer your questions specifically:

To install importmagic.el from a git checkout, you load importmagic.el into your Emacs and then M-x eval-buffer. There are fancier methods: straight.el explicitly supports this use case for example. But there's little drawback to doing it the simple way.

To run the tests, you execute cask exec ert-runner in the project's root directory. There are unit tests in test/ and behavior tests in features/. Cask helps set up your environment.