Re: [PATCH 12/33] peel_object(): give more specific information in return value

Michael Haggerty [off-list ref] writes:

Instead of just returning a success/failure bit, return an enumeration
value that explains the reason for any failure.  This will come in
handy shortly.

Signed-off-by: Michael Haggerty <redacted>
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This is a valid rewrite because all existing callers check if the
return value is 0 and does not check the error code against -1.

Looking good so far.