I don’t think you’re too cautious. Big upgrades and rewrites is somewhat of a „work hobby” of mine and this seems waaay too fast. I don’t know how the Bun canary process works and I guess their test suite is better than typical projects but still… I can’t imagine this working out well without testing it on a variety of big projects for a significant amount of time.

There’s probably loads(?) of observable behaviors that people rely on, consciously or not. Even _if_ the new thing is 100% spec compliant, it might still be breaking or otherwise problematic for heavy users.

That said, I’d love to be proven wrong. I use Bun from time to time on small stuff and I enjoy it, so I wish them well (: