Re: [PATCH v2 0/8] object_id part 4

Jeff King [off-list ref] writes:

I am on the fence regarding oidcpy/oidclr. I agree they _could_ be
struct assignments, but it is also convenient to have concept wrapped up
in a function, in case we ever want to do anything more complicated.

Also dedicated functions have documenation value.  There are some
things that currently use the same 40-hex that is the result of
running SHA-1 but are not object names (e.g.  patch id, and rerere
id).  They use the same hashcpy()/hashcmp() helpers as object names
do, but the code that use them probably do not want to be converted
to struct oid and oidcpy().