+1 this would be great, particularly if:<div> * subtypes can be extended</div><div> * subtypes can be generic partial specialisations (<a href="https://github.com/apple/swift-evolution/blob/master/proposals/0048-generic-typealias.md">https://github.com/apple/swift-evolution/blob/master/proposals/0048-generic-typealias.md</a>) <span></span><br><br>On Thursday, 24 March 2016, Andrey Tarantsov via swift-evolution &lt;<a href="javascript:_e(%7B%7D,&#39;cvml&#39;,&#39;swift-evolution@swift.org&#39;);" target="_blank">swift-evolution@swift.org</a>&gt; wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">+1, would love this.<br>
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A.<br>
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