Revision history

[prdoyle]

A thought: we could store every version of the state tree, and we could do it efficiently using reverse deltas like RCS did. The deltas could just be a path and a new (actually old) version of the state at that location. The reverse of a sequence of replace and delete operations is another sequence of replace and delete operations.

Here's the cool part: the BsonSurgeon component we developed for #2 could work, almost unchanged, to compose an older version of the state tree given the latest version and a sequence of reverse deltas!