``Branch.bind(other_branch)`` no longer takes a write lock on the other branch, and will not push or pull between the two branches. API users will need to perform a push or pull or update operation if they require branch synchronisation to take place. (Robert Collins)
``bzr bind`` no longer synchronises history with the master branch. Binding should be followed by an update or push to synchronise the two branches. This fixes bug #39542 for heavyweight checkouts. (Robert Collins)