Ignore evaluation built a Path and called relative_to (with its CPython quadratic parents
cost) per pattern per file, and re-parsed each pattern's flags every call. Replace it with a
lexical string-space relative computation (no Path construction, no exception control flow),
parse each pattern once into a process-wide cache, and memoize per-anchor relatives, segment
splits and is_dir per evaluation. Ignore decisions are unchanged (differential-fuzz
verified); ~50x faster on a pattern-heavy monorepo.
Azeem1985
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