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fix #51
cat> z.txt
を実行した時、z.txt
を入力ではなく出力として扱います。既知の不都合
hex2bin -r | hex2bin > z.txt
を実行すると、入力が受け付けられず固まります。これは今回の変更を行う前のバージョンでも発生するため、今回の変更による不都合ではないと考えられます。