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Re: [PATCH 3/5] pack-objects: add --sparse option

> +--sparse::
> +       Use the "sparse" algorithm to determine which objects to include in
> +       the pack. This can have significant performance benefits when computing
> +       a pack to send a small change. However, it is possible that extra
> +       objects are added to the pack-file if the included commits contain
> +       certain types of direct renames.

As a user, where do I find a discussion of these walking algorithms?
(i.e. how can I tell if I can really expect to gain performance benefits,
what are the tradeoffs? "If it were strictly better than the original,
it would be on by default" might be a thought of a user)