<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Apr 5, 2016, at 5:22 PM, Dave Abrahams via swift-evolution <<a href="mailto:swift-evolution@swift.org" class="">swift-evolution@swift.org</a>> wrote:</div><div class=""><span style="font-family: Palatino-Roman; font-size: 14px; 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-stroke-width: 0px; float: none; display: inline !important;" class="">I don't think that's obvious at all, because 0 ≮ 10</span><br style="font-family: Palatino-Roman; font-size: 14px; 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-stroke-width: 0px;" class=""></div></blockquote></div><br class=""><div class="">Points brought up elsewhere:</div><div class=""><br class=""></div><div class="">* A range does not have direction, it is is an area of variation between lower and upper limits.</div><div class="">* A range does not go from a larger amount to a smaller amount because it is not a sequence</div><div class="">* Much of this problem goes away with striding (as Dave pointed out several times, sorry Dave)</div><div class=""><br class=""></div><div class="">After consideration, I have been persuaded to the opinion that</div><div class=""><br class=""></div><div class=""><blockquote type="cite" style="font-family: Palatino-Roman;" class=""> stride(from: 0, to: -10, by: -1)</blockquote><br class=""></div><div class="">and </div><div class=""><br class=""></div><div class=""><blockquote type="cite" style="font-family: Palatino-Roman;" class=""> (-9...0).reverse()</blockquote><br class=""></div><div class="">both represent the numbers -9, -8,...,0 better than any alternatives I have offered. I still</div><div class="">prefer the stride version for intent and clarity.</div><div class=""><br class=""></div><div class="">That said, I also prefer my revised SE-0051 semantics for better representing what strides will</div><div class="">attempt to do.</div><div class=""><br class=""></div><div class="">-- Erica</div><div class="">p.s. Thanks all for the patient explanations</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div></body></html>