pull: use `stepsdone` instead of `todosteps`...
pull: use `stepsdone` instead of `todosteps`
The push process uses a `stepsdone` attribute instead of a `todosteps` one (with
the logic swapped). We unify the two process by picking the `stepsdone` version.
I feel like `stepsdone` better fits extensions that would want to extend the push
exchange process.
