For our implementation of an external DirProvider with custom authorities, we need access to the v3indent property of the Authority structure, which was recently restricted to crate-only access.
This MR proposes to expose this field as pub under the experimental-api feature.
I'm going to merge this, but: do you need to read the information from an existing Authority, or are you constructing your own? If the latter, AuthorityBuilder is probably what you want.
As it is, we need to read the v3ident: we are using unvalidated.authorities_are_correct() (as in the original DirProvider), and that call requires authority IDs...
