Char Ord   Bits
   --------------------
    \0        0000 0000
    j   106   0110 1010
    u   117   0111 0101
    
    Discard the first 4 bits of \0, leaves:
    0000 0110   -> 6    -> \cF
    1010 0111   -> 167  -> \xA7
    0101 ....