what is a string?

[Alberto Candel]

I was thinking of doing compositions of programs. nib() was juts an example, it could be taking a string of 01 and converting that into a string of other characters, for example, replacing 0 by 01 and 1 by 1.

If the input to nib() was the output to bin(), I was not sure how to handle the quotation marks in the output to bin().

But doing as you say, writing RETURN(EXPR(B)) works for me. Thank you.