[Pitch] Observation (Revised)

[quentinfasquel (Quentin)]

What about availability pre-iOS 17 ?!

Backporting Swift 5.9's observability

Swift 5.9's observability feature is restricted to the upcoming new versions of Apple platforms : macOS 14.0, iOS 17.0, watchOS 10.0 and tvOS 17.0 ... The feature is promising, but restricted to the latest platforms. That's quite disappointing. There doesn't seem to be any reason for it, can we please have this backported the same way async/await was ? To be compatible with iOS 13​.​0, macOS 10​.​15, watchOS 6​.​0 and tvOS 13​.​0