.arcconfig

shelve: write metadata file on the fly if they are missing

Keeping an explicit reference to the shelve node in order to reuse it directly
if the unshelved is repeated (eg: unshelve --keep).

{
    "conduit_uri": "https://phab.mercurial-scm.org/api",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}