feature request for support of shallow-since in addition to fetch-depth

[ns-ggeorgiev]

git now supports shallow-since for clone and fetch. There are a lot of scenarios that this make more sense than arbitrary depth

My request is for adding option that will allow for using this git feature

[Jack-Works]

this can improve changesets/action#201 which requires tag & commit history but does not need files of it

[ryan-williams]

#619 seems to implement it, but "has conflicts that must be resolved"