Hojun-Cho e9c3f75fd1 lib: graduate utf8.runesz and bufio.readbyte to (i32 | void) ...

Both used the -1 sentinel return; both had no external callers, so
the graduation is purely the API-shape change. utf8.runesz uses void
for "rune outside legal range"; bufio.readbyte uses void for EOF
(empty buffer). The full Hare shapes ((size | invalid) and
(u8 | EOF | io::error)) are still richer than this — those richer
returns arrive when utf8 grows an explicit invalid type and bufio
wires through io::stream's error path.

2026-05-12 02:12:33 +09:00

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