view .arcconfig @ 42137:d086ba387ae8

upgrade: support upgrade to/from zstd storage (issue6088)

Now that we have an official config option for a shiny format improvement, we
better make it simple to migrate to/from it.

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