SE-0104 Protocol-oriented integers がmasterにマージされたんですね。 https://github.com/apple/swift/pull/3796#issuecomment-294096066 チューニングはこれからやりますと。

New integer protocols by dabrahams · Pull Request #3796 · apple/...

Work on integers from @moiseev What's in this pull request? Resolved bug number: (SR-) Before merging this pull request to apple/swift repository: Test pull request on Swift continuous integr...