Yes
That was only practical because we already had a large test suite
boutell on Hacker News
In the thread “Shopify is moving from React Native back to Swift and Kotlin”
Helped: Large existing test suite and translation-shaped problem.
… In my case, I added SQLite and Postgres adapters to a formerly MongoDB-specific CMS, including support for a largely compatible API, "in one wild weekend..." followed by lots of verification. That was only practical because we already had a large test suite. But it was still a task that would have been out of the question for our team size before Opus 4.6 or so. …