4 [ $'hello\0world' = hello ]
5 [ $'hello\0'$'world' = helloworld ]
6 [ $'hello\000' = hello ]
7 [ $'hello\000world' = hello ]
8 [ $'hello\000'$'world' = helloworld ]
9 [ $'hello\x00' = hello ]
10 [ $'hello\x00world' = hello ]
11 [ $'hello\x00'$'world' = helloworld ]