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The fact that I'm writing Swift apps, releasing them to App Store and testing those apps on iPhone 5/4s and having zero problems with that?

The "32 bit Runtime" is a misnomer. Its a difference between the modern and legacy runtime. iOS (and iPhoneOS) never supported the legacy runtime.

The name comes from it being the only runtime for 32 bit OSX apps.

the legacy runtime before the `non-fragile` one?