It's not always perfect, but it's certainly much more stable than it was a few years ago, and it continues to improve with each release. A few years ago I had

It's not always perfect, but it's certainly much more stable than it was a few years ago, and it continues to improve with each release. A few years ago I had to spend weeks with each new Swift release debugging segfaults and working around Foundation bugs and missing features, but lately my Mac-tested code usually works just fine on Linux (except for the occasional problem with C library dependencies or platform-specific APIs).