view .arcconfig @ 51676:031d66801d5f

typing: add a trivial type hint to `mercurial/posix.py` to avoid an @overload

Since hg 3dbc7b1ecaba, pytype added an `@overload` for this function, without a
type on the parameter.  That's wrong, and undermines the hints on the
non-trivial functions.

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