.arcconfig

revlog: properly detect corrupted revlog in `index_get_length`

Pointed out by Yuya Nishihara.

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