On Fri, Jan 23, 2015 at 7:30 PM, Peter Dimov
Which is why I merge to master sooner rather than later. Of course, there is no single optimal strategy. For core libraries, specifically, on the one hand, you can break the world if your master doesn't work, on the other, nobody else can merge to master if they depend on your changes being merged first.
Ideally such updates would be merged atomically, though that might be rather difficult. In theory it might work with something like Debian testing and unstable package repositories. Updates are uploaded to unstable and they only propagate to testing if the result in testing would be 'good'. An updated (and breaking) core pkg wouldn't go into testing until all packages depending on it have been updated too. -- Olaf