-- `ord` returns the Unicode codepoint of the first character of a string.
-- `chr` is the inverse: it returns a single-character string for a codepoint.
-- Together they unblock per-char text work (NLP, classifiers, ASCII-fold).
ord-h>n;ord "H"
chr-72>t;chr 72
roundtrip>t;chr ord "z"
digit>n;ord "0"
chr-zero>n;ord chr 0
-- run: ord-h
-- out: 72
-- run: chr-72
-- out: H
-- run: roundtrip
-- out: z
-- run: digit
-- out: 48
-- run: chr-zero
-- out: 0