Problem: packed UTF 9

Code: packed+UTF+9/tails+%28%3E%3D0.22%29_1645290154

Nibbles version: 0.2 | 0.21 | 0.22 | 0.23 | 0.24 | 0.25 | 1.00

Format: Compact | Simple | +Type | Table | JSON | .nbl (DeBruijn) | .nbl (names)

Note: This code seems to be written in Nibbles version >= 0.22

(implicit string concatenation) 
    << (init) 
        \ (reverse) 
            * (join) 
                : (append) 
                    512 (integer) 
                    << (init) 
                        "\n" (string) 
                \ (reverse) 
                    % (split (remove empties)) 
                        @ (= fstLine) 
                        ~ (auto = words) 
    ch (chr) 
        (implicit arg = fstInt)