More expressive version constraints for pins

[kit-ty-kate]

I would be awesome to have something like this:
opam pin apackage "< 9999"

This would allow in this case, to have upgrades for this package but without reaching the dev version.

[kit-ty-kate]

Ping

[AltGr]

Oh, I remember quite clearly writing an answer to this a while ago, must have skipped the "submit" button... Sorry.

That would be possible, but the pinning handling relies in quite a few places on a fixed version: the other versions of the same package are filtered out and hidden. That's actually the common ground between version and source pinning ; so adding this feature would be non-trivial, this would probably need a new mechanism.

At a much lower level, you could pin a virtual package and add this constraint to it ; not very convenient I admit.