How to describe --contains

[CraftSpider]

I need to find the oldest tag that contains a given commit. With git, I'd use git describe --contains --match '...' <commit>, but I can't figure out any equivalent with gix. I've also checked for some kind of 'reachable from' helper to implement it myself, but that also seems to be missing, or at least I can't find it under the search terms I've tried. Anyone know whether this is possible with gix efficiently, and if not, what would be needed to implement it? I'd be willing to help out with necessary implementation work.

Just for context, I did also check git2, it also appears to be missing this functionality (the C API has a reachable function which would help, but it doesn't seem to be exposed).

[Byron]

Thanks for bringing this up!

Right now there is no such functionality, but I think it could be added here.
That function generally shows how it's done, and how it can be done performantly, but I don't know how it would best be implemented. Usually I study the Git source code and try to translate that into the utilities available in this codebase.

Your help in getting this done would definitely be appreciated.