Bug: using form.buffer() and form.done() in conjunction with useHistorySync() can lead to mismatched history indexes

[dxinteractive]

Because form.buffer() and form.done() aren't global, and they rely on callAllChangeCallbacks() not being called in order to buffer changes.

[dxinteractive]

WIP: https://github.com/dxinteractive/dendriform/tree/feature/sync-stack-demo

[dxinteractive]

This may also be an issue with useHistorySync() and form.replace()