[swift-evolution] Three quick(ish) generics enhancements; *maybe* phase 1

[Georgios Moschovitis]

> I’m happy to sacrifice cool new features in the short-term to ensure that Swift has a fantastic long-term future.

While I totally I agree with prioritising for the long-term, I find a 20-year horizon impractical.
I hope Swift will converge to a fantastic general-purpose language much sooner :-)