ピッチ投稿 [Pitch] Add
remove(where:) Method for Set and Dictionary
https://forums.swift.org/t/pitch-add-remove-where-method-for-set-and-dictionary/77165 SEドラフト https://github.com/swiftlang/swift-evolution/pull/2647 実装 https://github.com/swiftlang/swift/pull/78600 
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