FEP-1b12: Group federation

Depends on how this requirement will be specified. If it is something like “…MAY add a property to Group actor”, it can be added:

A proposal with status FINAL can not be changed or updated in a way that would lead to adjustments to implementations. Minor corrections are allowed.

But I think it would be better to publish a revised version of this FEP, because it is not up to date. For example, it describes audience field, which is not used by Lemmy anymore.

FINAL is supposed to be a signal that FEP is safe to implement. A new FEP can easily be published if changes are necessary, so there is no need for 2.0 versions.