It was a design bug not a implementation bug. Beta 2 behaviour matched the docs at that time but there was plenty of pushback about the behaviour in radars, Ap

It was a design bug not a implementation bug. Beta 2 behaviour matched the docs at that time but there was plenty of pushback about the behaviour in radars, Apple dev forums[0] and on the wider web[1]. Chris Lattner announced[0] the planned change on the forum 19th June. [0] https://devforums.apple.com/message/989944#989944 https://devforums.apple.com/message/989944#989944 [1] http://blog.human-friendly.com/swift-arrays-too-swift-and-flexible-for-our-good http://blog.human-friendly.com/swift-arrays-too-swift-and-fl...