ああーそうか、他にもあり得るか

12:59 PM

https://developer.apple.com/documentation/foundation/mutabledataprotocol/3139186-resetbytes

12:59 PM

https://developer.apple.com/documentation/swift/rangereplaceablecollection/3018253-append

12:59 PM

この辺のMutablrCollectionのさらにサブプロトコルで

12:59 PM

mutating funcがいますね