normalizeRune guarded with 0x00C0..0xFF61, which does not exclude Hangul,
CJK or Cyrillic, so every rune of those scripts hashed into the map only
to miss. Every key of the map folds to ASCII, so the bitmap added for the
rune prefilter rejects them without a lookup.
- Non-ASCII queries 1.21x where every line is CJK, 1.05x on mostly-ASCII
paths behind a Hangul prefix
- ASCII queries unchanged, the prefilter already skips Phase 2 for them
- Normalization share of query time for a non-ASCII query: 17.2% -> 0%
Junegunn Choi
465837f3ad