Earlier remote.pushdefault (and per-branch branch.*.pushremote)
were introduced as an additional mechanism to choose what
repository to push into when "git push" did not say it from the
command line, to help people who push to a repository that is
different from where they fetch from. This attempts to finish that
topic by teaching the default mechanism to choose branch in the
remote repository to be updated by such a push.
The 'current', 'matching' and 'nothing' modes (specified by the
push.default configuration variable) extend to such a "triangular"
workflow naturally, but 'upstream' and 'simple' have to be updated.
. 'upstream' is about pushing back to update the branch in the
remote repository that the current branch fetches from and
integrates with, it errors out in a triangular workflow.
. 'simple' is meant to help new people by avoiding mistakes, and
will be the safe default in Git 2.0.
In a non-triangular workflow, it will continue to act as a cross
between 'upstream' and 'current' in that it pushes to the current
branch's @{upstream} only when it is set to the same name as the
current branch (e.g. your 'master' forks from the 'master' from
the central repository).
In a triangular workflow, this series tentatively defines it as
the same as 'current', but we may have to tighten it to avoid
surprises in some way.