.arcconfig

grep: speed up `hg grep --all-files some/path` by using ctx.matches(match)

ctx.matches(match) avoids walking unintersting parts of the tree when
using tree manifests. That can make a very big difference when
grepping in a small subset of the tree (2.0s -> 0.7s in my case, but
can of course be made more extreme by picking a smaller subset of
files).

Differential Revision: https://phab.mercurial-scm.org/D7820

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    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}