.arcconfig

perf: offer full details in perfrevlogwrite

This will be useful for people who want to study the timing pattern more
closely.

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