Wishing there was a bit more Swift 3 documentation in between the overview swift.org/migration-guide/ and the long form github.com/apple/swift-evolution

For example: closure arguments are non-escaping unless you say (at)escaping. I can’t find this documented on developer.apple.com.

Only the proposal github.com/apple/swift-evolution/blob/master/proposals/0103-make-noescape-default.md