There is no ETA on 1.0, but breakage has followed the pattern of it not really being hard to upgrade to a newer version, as it is very well documented on the version release notes.

writergate was not smooth, a lot of things that moved over to writer (Writer.Allocating for instance) had no documentation and I had to go read the zig source code to figure it out. the docs were just "instead of That use This"