view .arcconfig @ 38852:a3dacabd476b

index: don't allow index[len(index)] to mean nullid

Now everything else has been cleaned up and we can drop support for
getting the nullid from the end of the index (from *past* the end
actually, since we reduced the length in the previous patch).

Differential Revision: https://phab.mercurial-scm.org/D4023

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