[swift-evolution] extending typealiases

[Matt Whiteside]

In Swift 3.1, I was happy to see that we can now extend types with concrete constraints.  I think one other feature which fits nicely with this new capability would be extending typealiases, like this:

typealias Vector = Array<Float>

extension Vector { 
   ...
}

Which currently doesn't compile due to:  "Constrained extension must be declared on the unspecialized generic type 'Array' with constraints specified by a 'where’ clause”

What is other people’s interest level?  How possible would it be to add this?

-Matt



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