[ $'hello\0' = hello ] [ $'hello\0world' = hello ] [ $'hello\0'$'world' = helloworld ] [ $'hello\000' = hello ] [ $'hello\000world' = hello ] [ $'hello\000'$'world' = helloworld ] [ $'hello\x00' = hello ] [ $'hello\x00world' = hello ] [ $'hello\x00'$'world' = helloworld ]