CSV fuzzy match

Uses Unicode code-point Levenshtein distance. Similarity is 100 times one minus distance divided by the longer normalized length. Suggestions never automatically merge records; a right-side record may match several source records. Up to 1,000,000 characters, 10,000 data records, 100 columns and 100,000 cells across the sources. Files for multi-source tools are limited to 4,000,000 bytes total. Reports retain at most 500 diagnostic findings and state any omitted count. CSV and JSON outputs are limited to 4,000,000 characters. Fuzzy matching additionally limits selected cells to 256 code points, comparisons to 25,000 pairs and estimated edit-distance work to 5,000,000 cells. Output is budgeted incrementally before retaining each row; expanded decimal output counts toward the same 4,000,000-character limit even when input uses short exponent notation. Paste CSV data with unique column headers. Quoted multiline cells are supported. Up to 1,000,000 characters. Review the settings before running.