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それはオーバーヘッドが出ますね dynamicCallableじゃなくてstaticCallableが出るのでそれを待ったほうがいいです https://forums.swift.org/t/se-0253-static-callables/22243
The review of SE-0253: Static callables begins now and runs through April 5, 2019. Reviews are an important part of the Swift evolution process. All review feedback should be either on this forum thread or, if you would like to keep your feedback private, directly to me as t...