pack-objects: mark index-version option as NONEG
Running "git pack-objects --no-index-version" will segfault, since the callback is not prepared to handle the "unset" flag. In theory this might be used to counteract an earlier "--index-version", or override a pack.indexversion config setting. But the semantics aren't immediately obvious, and it's unlikely anybody wants this. Let's just disable the broken option for now. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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