[swift-evolution] Quick question: Constraint Aliasing

[Erica Sadun]

Can anyone give me a rough estimate of how hard (in terms of coding, not in terms of Swift Evolution process) it would be to adopt (1) `extension Set<ShippingOptions>` as an outright alias for `extension Set where Element == ShippingOptions` and (2) `extension [ShippingOptions]` for `extension Array where Element == ShippingOptions`?

Thanks,

-- E