bug#54359: 29.0.50; [PATCH] Undo breaking change to project interface

[Lars Ingebrigtsen]

Dmitry Gutov <dgutov@yandex.ru> writes:

> And my/project-try-local shouldn't reuse the data type belonging to
> the vc project type either.
>
> If it used its own type tag and generic method implementations, it
> wouldn't see this kind of breakage.

It seems that (at least) two users have bumped into this problem, so
it might be worth considering doing this caching a different way.

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