<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class="">Dear Core Devs, </div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><div class="">There is a vicious bug in Darwin’s Objc implementation of JSON number encoding that irritates the president Macron :) this fact is well established. (check <a href="https://bugs.swift.org/browse/SR-6631" class="">SR-6631</a> for details) </div></div><div class="">But there is more, i've found an interesting variante that demonstrates that an equivalent issue exists in the Swift Core Foundations.</div><span class=""><div class=""><br class=""></div><div class="">How to reproduce some correlated issues in swift-corelibs-foundation ? </div><div class=""><br class=""></div></span><span class="">1- write `setlocale(LC_ALL,"fr_FR »)` in `swift-corelibs-foundation/TestFoundation/main.swift`<br class=""></span><span class="">2- Run the tests. </span>=> The unit tests will crash. <a href="https://clients.pereira-da-silva.com/apple/core-lib-test-crash.png" class="">https://clients.pereira-da-silva.com/apple/core-lib-test-crash.png</a><div class=""><div class=""><span class=""><br class=""></span></div><div class="">Setting a locale globally before running tests is not a normal procedure, but i do maintain that all critical test suites should be tested against a bunch of Locales to determinate possible localization impact.</div><div class="">I think that running at least all the tests suites once with various locales would enable to determinate if there are other blind spots.</div><div class="">When those spot will be clearly located we could apply a systematic multi local testing procedure to specific code areas to reduce the tests loads.</div><div class=""><br class=""></div><div class="">Best regards,</div><div class=""><span class=""><br class=""></span></div><div class=""><span class="">PS: </span>@chris, you are in copy of this mail because i would appreciate to have your opinion on a what general testing strategy we could apply to prevent internationalization blind spot issues.</div><div class=""><span class=""><br class=""></span></div><div class=""><span class=""><br class=""></span></div><div class=""><br class=""></div><div class=""><span class=""><br class=""></span><span class=""><div class="">Benoit Pereira da Silva<br class="">Ultra Mobile Developer & Movement Activist<br class="">Développeur Ultra Mobile & Militant du mouvement<br class=""><a href="https://pereira-da-silva.com" class="">https://pereira-da-silva.com</a><br class=""><span style="color: rgb(0, 0, 0); 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