<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 Mar 7, 2017, at 8:08 AM, Edward Connell <<a href="mailto:ewconnell@gmail.com" class="">ewconnell@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div style="font-family: Alegreya-Regular; font-size: 15px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;" class="">My question is, what was their design intent? Rebuild all dependents every time?</div></div></blockquote></div><br class=""><div class="">Swift started out by piggybacking on facilities provided by Foundation. Over time it’s becoming self-sufficient, but it’s a work in progress. Putting “design intent” in the past tense is inaccurate … I would say that this seems to be something to come in the future.</div><div class=""><br class=""></div><div class="">Are you asking how to use KVO with Swift arrays, or are you looking at pure Swift?</div><div class=""><br class=""></div><div class="">—Jens</div></body></html>