[alexhutcheson]

Yes, although if you can prove convincingly that it's a 100% safe change you can often get approval from someone who has approval power for most of the repository.

In practice, if you're changing 100+ individual callsites, then you would probably make a backwards-compatible change, then use an automated system to send out and manage a bunch of different commits to clean up call sites, then clean up your old function signature once all the commits are submitted. If your code isn't a really widely used library then you probably have fewer than 20 callsites, though, so it's nice to be able to do it in one commit.