I just fixed it! if I do this:
[date|val} = head
[val|_] = val
and in the output string that gets sent to the next recursion, I just Integer.to_string(val)
then it works 
You still get credit because your comment
That error indicates that you’re sending a list of a single integer to byte_size
Is what clued me in.
Not sure if that’s the correct way to solve it though…
Thanks!
