I noticed that `rbt post` sends a cumulative diff along with the individual 
commit diffs, and this diff is generated using the syntax `git diff A..B`. 
I have a couple questions:

   1. What is the purpose of this cumulative diff?
   2. This generates a diff between the current state of `A` against the 
   current state of `B`, which can extremely large if `A` has progressed since 
   `B` was branched off of it. Why is this needed? Why not just compare 
   against the merge-base of `A` and `B`, e.g. by doing `git diff A...B` 
   instead?

Cheers!

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