Hi Philip,
thanks for the hint with the ByteArray.
const ByteArray = imports.byteArray;
let a = new ByteArray.ByteArray();
let b = new ByteArray.ByteArray();
a[0] = 97;
a[1] = 98;
b[0] = 'a' ;
b[1] = 'b' ;
print(a);
print(b);
prints
ab
<blank>
Haven't figured out how to solve it yet...