May 2026 – Tar repository (uutils/tar) performance-focused enhancement delivered via output buffering optimization. Implemented buffering for verbose and listing outputs using BufWriter<StdoutLock>, reducing write calls and increasing efficiency in IO-heavy tar operations. Commit 840b16bd8fd53a2fe4e8780d710014c2908b9870 (Merge PR #163 from kaladron/fast-t; perf: use BufWriter<StdoutLock> for all verbose/listing output).

January 2026 (2026-01) monthly summary for uutils/coreutils focusing on reliability and internationalization. Key features delivered and major bugs fixed, with business value and technical achievements. Highlights: 1) Benchmarking stability improvement: disabled intermittent tsort_input_parsing_heavy to ensure reliable benchmarking results; generate_input_parsing_heavy is commented out; rationale documented in code. 2) Locale-aware date formatting and calendar support: ICU-based localization for day and month names; era-aware calendars (Buddhist, Persian Solar Hijri, Ethiopian) with era-year support in date formatting, while preserving Gregorian compatibility. Commits involved: b5ea1a728abacd25ccf776a0acf80aed1f17894c; e1259d984f1cfd98e6154ce79476dd3d3ce05d2b; 6124866934900219a4fba24c2ff3e3dead0c654c.