Ævar Arnfjörð Bjarmason [off-list ref] writes:
It needing to be bidirectional is a very good point, and I think that
makes my suggestion a non-starter. Thanks.
Yes, it is a bit sad that we need to carry the mistakes forward
while moving to the new hash, but bidi convertibility is a must
for the transition to work smoothly, I think.
Thanks for a good discussion. FWIW, on the original issue that
brought it up, I think using "object name" from the glossary to
move away from saying "SHA-1" would be good.