The byte-indexed silent-clamp sub from ww was Hare's bytesub wearing
the wrong name. Renamed accordingly; added the real rune-indexed sub
per ref/hare/strings/sub.ha:30-42, with utf8bytelenbounded helper
per :10. Both forms assert on start>end; bytesub also asserts
end<=len(s).
lib/getopt/getopt.ww:314 migrated to bytesub — its bi index is a
byte offset over the arg's bytes.
Tests cover ASCII parity, multi-byte UTF-8 (こんにちは / héllo) where
rune index ≠ byte index, and a row contrasting identical args to
make the distinction explicit. OOB-abort coverage deferred until
the assert_aborts harness lands (#38).
Selfhost combined.ww snapshots regenerated — they're bootstrap-stage
inputs and would otherwise compile the old byte-wise sub. Two-arg
default form omitted (#37, ww has no default parameter values).
Hojun-Cho
031f5f9ec8