Comment 1 for bug 692380

Indeed, Uhm, I wanted to avoid the register-everything thing that bzr does, if possible, so I deferred multiple-repo-type lookup.

What I'd like to see in a patch addressing this:
 - local lookups do not load non-local repository types
 - without a lazy-importer
 - remote lookups only load probes that are plausible (e.g. if a remote repo doesn't understand sftp, an sftp url should not result in that repo's probe being loaded)

Something like:
 - a multiple-dispatch factory
 - which flattens the url scheme and uses that to load repository/<scheme> as a module
 - if we have multiple repos for (say) http, then http would be a package, and there would be a defined entry point in http that takes care of probing efficiently. e.g. by trying for url matching logic first, then request based checks.