Miller Files

New verbs and DSL features

• mlr rank verb, sparkline DSL function and verb, bootstrap-ci verb for bootstrap-resampling confidence intervals
• Sliding-window mode for stats1 -w {n}, more step -a back-reference options
• Positional placeholders ({1}, etc.) in the format DSL function
• --right-align-numeric for PPRINT/Markdown output
• Named .mlrrc profile sections via --profile/-P
• mlr join --ignore-empty to skip pairing on empty join keys
• New GNU recutils (.rec) I/O format
• YAML now follows JSON's auto-flatten/auto-unflatten behavior

Documentation

• Numerous new recipes/guides: wide-CSV transposition, updating a CSV from partial downloads, merging files with colliding column names, combining CSVs with different headers, SQL-style join examples, preprocessing join's left file, --lazy-quotes semantics, malformed-TZ troubleshooting, STAN-format JSON-array reshaping
• Clarified docs for uniq, join format flags, summary field types, NF dynamism
• Published an epub of the docs on https://miller.readthedocs.io/en/latest

Bug fixes

• tee/split no longer leak downstream mutations into side-output files (#1671)
• Fixed float formatting (e.g. 004.56) to emit valid JSON numbers
• --ors crlf is now honored for CSV output (#1810)
• reorder -r groups matched fields by regex order, not record order (#1325)
• Fixed dedupe-field-names clobbering values on ragged short rows (#1997)
• --skip-trivial-records now exits 0 on trailing blank CSV/TSV lines
• join exits nonzero if the left file can't be read (#2169)
• DKVPX reader now honors --ifs/--ips instead of hardcoding comma/equals
• Fixed recutils parser for empty fields with +-continuation
• Fixed a mid-stream error-loss race causing flaky exit codes on transformer errors

Internal/infra

• Multi-phase removal of os.Exit calls below the entrypoint (5 phases) for cleaner exit-code handling
• Guard against release tags being cut before the version-bump commit lands
• Plans checked in for future work: exit-handling, recutils, r-strings, format-from-extension inference, nested/JSON-style accessors in non-DSL verbs
• Routine dependency bumps (golang.org/x/*, codeql-action, go-isatty, etc.)

Full diff: https://github.com/johnkerl/miller/compare/v6.20.2...v6.21.0