John Keeping <> writes:

>> But it is not a big problem.  Either 3-way merge notices that there
>> is nothing new, or you get a conflict and have chance to inspect
>> what is going on.
> It's not a problem here, but false negatives would be annoying if you're
> looking at "git log --cherry-mark".

The primary thing to notice is that it is not a new problem with or
without the caching layer.  As Linus mentioned how patch-ids are
computed by ignoring offsets and whitespaces, the filtering is done
as a crude approximation and false negatives are part of design, so
making the cache more complex by recording hash of the binary and/or
options used to compute misses the fundamental.
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