[swift-evolution] [Pitch] Several improvements points about extension and typealias

frogcjn at 163.com frogcjn at 163.com
Wed Oct 5 10:00:23 CDT 2016

1. Allow extension specific dictionary
extension Dictionary where Key == String, Value == String
extension Dictionary<String, String>

2. Allow extending Equatable internally
currently any type extend to Equatable should make theme public

3. Allow internal typealias for a public type
this internal typealias will only can be used in that package.


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