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Hi all, I thought I would drop a comment on the maintainability/sustainability of the feynman package given that you are using it more and more in these lectures and it happens that I got in touch recently with the author. He stated that "Thank you for your email. I'm happy that my code is useful to the HEP community, but my primary interest is in condensed matter physics. ... but I remain available for any request for improvement to the code.". This is a warning as the package is unlikely to be very much maintained just now (check the dates of the last commits) and even less in the future.
What's your take? We, I mean the HEP community, might even suggest to take over the package? Dunno. Thoughts?