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//! Improvements over prior version: //! - Uses `csv::ByteRecord` instead of raw `&[u8]` so “column” access is correct. //! - Caches column index (lazy) and precompiles regex for speed. //! - Robust numeric parsing (trim + friendly errors). //! - Fast substring search via `memchr::memmem` (no manual windowing). //! - Treats common empty/NA tokens as empty when desired. //! - Clearer descriptions and tighter tests.
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//! Improvements over prior version:
//! - Uses
csv::ByteRecordinstead of raw&[u8]so “column” access is correct. //! - Caches column index (lazy) and precompiles regex for speed. //! - Robust numeric parsing (trim + friendly errors). //! - Fast substring search viamemchr::memmem(no manual windowing). //! - Treats common empty/NA tokens as empty when desired. //! - Clearer descriptions and tighter tests.