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tarunon 3/31/2017 11:26 AM
あーこれかなー
11:27 AM
https://github.com/apple/swift-corelibs-foundation/blob/master/Foundation/NSString.swift
apple/swift-corelibs-foundation
swift-corelibs-foundation - The Foundation Project, providing core utilities, internationalization, and OS independence
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11:27 AM
下の方に魔術用の型が存在する