[Python-Dev] Re: New public C API functions must not steal references or return borrowed references

I (with a lot of help and input from other people) wrote up some of the thinking behind these kinds of API issues for the HPy project -- https://github.com/hpyproject/hpy/wiki/c-api-next-level-changes#what-needs-t... It's written from an HPy point of view and if you've already thought about these things a lot none of it may be new to you and you may have your own opinions, but hopefully it's a good introduction to the issues if one is new to them.