<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div><blockquote type="cite" class=""><div class="">On Apr 28, 2017, at 5:06 PM, Douglas Gregor via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><ul class="" style="font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; box-sizing: border-box; padding-left: 2em; margin-top: 0px; margin-bottom: 16px; color: rgb(36, 41, 46); font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; font-size: 16px; background-color: rgb(255, 255, 255);"><li class="" style="box-sizing: border-box;">What is your evaluation of the proposal?</li></ul></div></blockquote><div>I'm in favor of this proposal, and I don't agree with the previous reviewers who think this should be coupled with more advanced type system features. However, I have a few questions:</div><div><br class=""></div><div>* How will associated type inference interact with this? If you write a type-specific `filter`, will it be automatically favored over the `Array` version, or will you have to manually specify a `Filtered` typealias?</div><div><br class=""></div><div>* Do we want to constrain `Filtered` to `Sequence` or `Collection`? Do we want to require `where Filtered.Iterator.Element == Self.Iterator.Element`?</div><div><br class=""></div><div>* Will `AnySequence`/`AnyCollection` have a `Filtered` of type `AnySequence`/`AnyCollection`, or one of type `Array`?</div><div><br class=""></div><div>No time for a full review, but I thought it'd be helpful to note these things before the review period was up.</div><div><br class=""></div></div><div class="">
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div class=""><div style="font-size: 12px; " class="">-- </div><div style="font-size: 12px; " class="">Brent Royal-Gordon</div><div style="font-size: 12px; " class="">Architechies</div></div></span>
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