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Behavior change: CSV now follows RFC 4180. -i csv no longer interprets \n, \t and \\ inside quoted fields ("C:\new" stays C:\new), and keeps a lone \r inside a field (only the \r of a CRLF line ending is dropped). -o csv and escape_csv()/escape("csv", s) keep line breaks inside quotes instead of writing \n/\t, also quote fields with \r or leading/trailing spaces, and -o csv ends records with \n instead of \r\n (use -v 'ORS=\r\n' for CRLF)
Add PROCINFO["sorted_in"] support for for (k in arr): all of gawk's predefined orders (@ind_str_asc, @ind_num_desc, @val_num_asc, @val_type_desc, ...). A user-defined comparison function is a fatal error instead of being silently ignored
IGNORECASE now also applies, as in gawk, to string comparisons (==, !=, <, ..., and switch string cases) and index(), comparing Unicode characters case-insensitively, and to single-character regex literals such as split(s, a, /x/). A single-character string separator (FS = "x", split(s, a, "x")) stays literal
Add gawk's switch statement: switch (expr) { case 1: ... case "str": ... case /regex/: ... default: ... }. Numeric and string labels are compared with ==, regex labels with ~; a body falls through to the next case unless it ends with break, and continue applies to the enclosing loop. Duplicate case values and a duplicate default are syntax errors, as in gawk
Add f-string interpolation: f"Hello, {name}", f"{$1} at line {NR}". Only variable names and field references ({$1}, {$NF}) are substituted; {{/}} are literal braces
Add JSON Lines input format -i jsonl (alias ndjson): keys of the first record populate FI, e.g. zawk -i jsonl '{ print $FI["name"] }' demo.jsonl
Add parquet input format -i parquet: keys of the first record populate FI, e.g. zawk -i parquet '{ print $FI["name"] }' demo.parquet
