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Paul Morelle authored
An empty entry in the revlog may happen for two reasons:
- when the file is empty, and the revlog stores a snapshot;
- when there is a merge and both parents were identical.

`hg debugindex -m | awk '$3=="0"{print}' | wc -l` gives 1917 of such entries
in my clone of pypy, and 113 on my clone of mercurial.

These empty revision may be located at the end of a sparse chain, and in some
special cases may lead to read relatively large amounts of data for nothing.
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