Hi, Tomas and David,
we have already implemented and are using a biblio CRUD endpoint, and I know the Finland community has, too.
Sorry for not starting with a koha bug, but we simply didn't have the time...
Now, we would very much like to add /change this to a Koha native bug, but for now,
heres our local patch:
https://github.com/digibib/koha-docker/blob/master/koha-patched/patches/130-API-biblios-CRUD-expanded.patch
which is based on koha master.
Ah, c'mon. File a bug report and attach your patch, we can work on top of it to make it fit our QA requirements.
.