Fastmash 0.1.0

Added

• The GNU datamash 1.9 command language on Linux x86-64 and WSL2: aggregate
  statistics, grouping (-g, groupby) with optional sorting (-s),
  crosstab, field modes (reverse, noop), table modes (check,
  transpose, rmdup) and per-row operations (cut, rounding, binning,
  getnum, base64, checksums, path names).
• Named fields with input headers, generated output headers, custom field and
  output separators, whitespace splitting, NUL-terminated records, comment
  skipping, --vnlog input, missing-value removal (--narm), --format and
  --round.
• Strict quoted CSV input and output, selected independently with --csv-in
  and --csv-out, or together with --csv. Aggregate and per-row reports,
  grouping, headers and full copied fields retain decoded field boundaries;
  sorted CSV uses checked in-process storage with disk spill.
• Custom output labels with --result-name=INDEX:NAME for calculated columns,
  including dataset comparison's before, after and change columns.
• Table health inspection with bounded examples and readable or versioned TSV
  reports. Supplied type, presence and width rules can fail validation while
  inferred findings remain advisory. Health accepts ordinary delimited text.
• top:N FIELD and bottom:N FIELD: highest or lowest complete records,
  globally or per group, with stable original-input ties, explicit headers,
  text/CSV input and output, and sorted spill support.
• wmean VALUE:WEIGHT with finite nonnegative contribution weights, complete-pair
  missing-value removal, headers, grouping and checked binary80 range limits.
• compare BEFORE AFTER: numerical summaries aligned by complete keys, signed
  differences and percentage changes, optional change ranking, independent
  header binding and text/CSV formats. Both inputs finish before report output.
• Structured help and stream-specific terminal color for help, failure prefixes
  and readable health reports, with --color=auto|always|never and --no-color.
  Calculation data, CSV, health TSV and version output remain plain.
• Portable results: software 80-bit arithmetic, independent of the CPU and
  the C math library, with identical results on every supported machine.
• Built-in locale rules from glibc 2.43, needing no installed locale data:
  numbers in every UTF-8 locale with a one-byte decimal separator, and
  sorting in 194 language locales checked against glibc.
• In-process sorting with disk spill; supervised use of the system sort for
  the remaining routes.
  Spill works on any writable TMPDIR, using anonymous files where the
  filesystem supports them and private unlinked files elsewhere (NFS, a
  container's /tmp before Linux 6.10).

Differences from GNU datamash 1.9

See Differences from GNU datamash.