[jlgreco]

Ideally personal topic branches, not yet ready for world consumption, would be pushed but to a different repo. This would allow the main repo to have a global "No force pushes!" setting, and would prevent branch name collisions (how many developers have a scratch branch sitting around named 'scratch'?)

[crbnw00ts]

That's fine for some projects, but not every project follows that flow. One example: ompanies using GitHub Enterprise internally generally don't make every regular contributor to a project have their own fork (or at least they shouldn't, as it creates needless extra overhead). In that case, having some extra granularity around denying non-fastforward pushes to some branches but not others would be a helpful addition.