SequenceのAnySequenceを返すメソッドをArrayへ変える実験らしい https://github.com/apple/swift/pull/9639

[stdlib][WIP perf experiment] Replace AnySequence with Array in default Sequence methods by palimondo · Pull Request #9639 · apple/swift

This is an experiment to confirm that replacing AnySequence in default methods on Sequence with Array improves performance. This is a supporting argument to SE-NNNN Sequence Cleanup. At the moment,...