[swift-evolution] Property Behaviors and Swift 4.0 Stage 1.

[Wallacy]

Is Property Behaviors considered for Stage 1?

https://github.com/apple/swift-evolution/blob/master/proposals/0030-property-behavior-decls.md

Because the project roadmap says:

The high-priority features supporting Stage 1's source and ABI stability
goals are:
...
Resilience: resilience provides a way for public APIs to evolve over time,
while maintaining a stable ABI. For example, resilience eliminates the fragile
base class problem <https://en.wikipedia.org/wiki/Fragile_base_class> that
occurs in some object-oriented languages (e.g., C++) by describing the
types of API changes that can be made without breaking ABI (e.g., "a new
stored property or method can be added to a class").
...

And i think this feature will help with that. Not a complete solution for
resilience problem, but "provides a way for public APIs to evolve over time
".

Thanks.
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