nicowilliams/heimdal — comment on commit 6fce54a5b1f68e3fb6007bb17da5038bb7eb8489
File: base/db.c line 178
By lha:

don't care about unregister, its mostly doesn't work anyway, I know pam modules thinks it works, but in complex laying of frameworks it too hard tog get right. one example ObjC plugs can't really be unloaded because the register global state.