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Giancarlo Erra c2c616f4a3 fix(indexing): normalize extension casing and tighten docs/test (#77)
Address CodeRabbit review:
- getLanguageFromExtension/getAstGrepLang lowercase the extension before
  consulting the override map, so an uppercase ext still matches the
  lowercased keys (production callers already lowercase; .R collapses to
  .r with the same value, so no other behavior changes).
- README: clarify EXTRA_EXTENSIONS indexes as plaintext / leaf nodes,
  versus EXTENSION_LANGUAGE_MAP's full language treatment.
- Make the isIndexableFile override test hermetic (save/restore the prior
  map entry, assert against the captured baseline).
2026-06-28 20:59:25 +01:00
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