[swift-evolution] Fixing raw enum types

[Anton Zhilin]

Some criticism for all the mentioned variants:

enum Something : raw(Int32)
Requires adding a new contextual keyword.

enum Something : RawRepresentable
With additional typealias RawValue, the simplest cases will lose their
elegancy.

enum Something : RawRepresentable<Int32>
+1. But we don’t have generic protocols right now :(

enum Something<Int32>
-1. This way we would just trade overloading conformance syntax for
overloading generics syntax.
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