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>> - Modify the `supports-upgrades`[3] and `supports-accessible-upgrades`[4] tags
>>
>>    I have yet to look into the formal process around making changes to
>>    these tags but I will aim to make a start ASAP.
> 
> We've previously tried to avoid changing assert tag definitions because
> we then have to re-review all of the projects that already have the tags
> to ensure they meet the new criteria. It might be easier to add a new
> tag for assert:supports-fast-forward-upgrades with the criteria that are
> unique to this use case.

We already have a confusing array of upgrade tags, so I would really 
rather not add more that overlap in complicated ways. Most of the change 
here is clarification of things I think most people assume, so I don't 
think the validation effort will be a lot of work.

--Dan