APE23: Guidelines for required and optional dependencies #86
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This APE has been in the pipeline for a long time and was inspired by astropy/astropy#12448 - I decided to try and revive it and update it. The main goal here was to try and provide a framework for discussing/thinking about optional dependencies since there are different kinds of such dependencies.
I don't want to be too prescriptive here about what to do specifically about scipy, as I think that should be discussed in the relevant issue, and this is meant to be a more general APE.