histedit: add missing b prefix to a string If i18n is disabled (such as via HGPLAIN=1), `_()` doesn't convert from str to bytes, so this raises a TypeError on py3. Differential Revision: https://phab.mercurial-scm.org/D8354

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