string of compressed source code

[auxym]

If I understand correctly, you would like to include a non-printable byte, like 
0x15 (ASCII NAK), in a string literal in source code. If so you can do it using 
"x" escapes like this:
    
    
    const s = "hello\x15\x2f"
    
    
    Run

This does not increases (binary) code size.