.arcconfig

templatefilters: declare input type as bytes where appropriate

Some test outputs changed since input is now coerced to a byte string. I
think that's okay. Maybe {date} should have some readable representation?

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