We decided this won't help anyone long-term, as the signature to types still differs. With strong naming you *could* load both as a workaround, but the upgrade cutover has to happen at some point and this does it for the 2.0 release.

2.0 - change tracking PR; do not merge

While these were being cancelled already - we can still tidy into the extensions. When they were added we were competing on edits...now that we're clear we can do that cleanup pass.