Phabricator workflow vs. GitHub

[Niklas Hambüchen]

There are some things in these argumentations that I don't get.

When you have a stack of commits on top of master, like:

* C
|
* B
|
* A
|
* master

What do you use as base for `arc diff` for each of them?

If B depends on A (the patch expressed by B doesn't apply if A was applied first),
do you still use master as a base for B, or do you use Phabricator's feature to have diffs depend on other diffs?