Yes, return 0 causes it to not exit (which is the desired effect, as in
documented).
No, it's not an error. I suggest you read git-cat-file.1 -- getting a
response of "<object> missing" (rather than cat-file terminating) if you
pass in a non-existent object is the desired behavior, and it happened
before for named objects, like "HEAD", but not for full hashes. Now it
also happens for full hashes.
-- Lea
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