Speaking only from my experience using their rust crates, they have undergone more “code feng shui” than any of our other dependencies. They’re still 0.x and every point release seems to re-imagine things enough to break everything and require substantial rewriting. They don’t even bother describing the motivation for changes, just, you can’t use this type any more, it’s private now. You can’t configure metadata here any more, you have to do it there now. It’s been the most painful dependency of ours by far.