I don't think it was mentioned anywhere in the end-user facing "software update" changelog - if this is the right source https://support.apple.com/kb/DL1893?loc

I don't think it was mentioned anywhere in the end-user facing "software update" changelog - if this is the right source https://support.apple.com/kb/DL1893?locale=en_US https://support.apple.com/kb/DL1893?locale=en_US - but you are right that it was mentioned in the developer SDK release notes https://developer.apple.com/library/content/releasenotes/General/RN-iOSSDK-10.3/index.html https://developer.apple.com/library/content/releasenotes/Gen...