Re: [Bordeaux-threads-devel] Deprecating recursive locks

If the public API is changed in a not-backward-compatible way, I would suggest to release new ASDF system (bordeaux-threads2), and leave the old version available in quicklisp forever.

People who are ready to use new version, just add bordeaux-thread2 into their ASDF dependency. Others are able to use old version.

This is a good practice. And it costs nothing.

IMHO it's not a good practice and it does cost complexity/noise.

you lose the clarity around the digital representation(s) of the identity of the library. there's only one b-t library, and the fact that it has changed in a way that made it incompatible with something else does not change its identity.

but it's only the 0.02 of an outsider...