A really important point (which so far hasn't been addressed) is how to deal with breakages of affiliated packages. I see two ways:

1. If I make a change to some core package, it is my responsibility to ensure that no affiliated package breaks.

2. It is the responsibility of the affiliated package to fix breakages.

I think both of the above have problems:

With 1, the author of the core package might not have access to the affiliated package: how do you force your affiliated package to accept a needed change? This is the current situation with Sage and SageNB.

With 2, breakages will need to fixed after the fact (after the change to the core package has been merged already), leading to occasional breakages for end users. This is the current situation with Sage optional packages.

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