view .arcconfig @ 39646:f3d1229555d9

py3: ensure run-tests environment is uniformly str

subprocess.popen() was crashing, and when I printed out `env`, all of the keys
and most of the values were str.  Except these.

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