• CSS: fix bug with var() in background, fixes #603
• XML: keep unquoted attribute values untouched, fixes #611
• cmd: add .rss, .xhtml, and .webmanifest mimetypes, see #438
• cmd: use tdewolff/argp for argument parsing; support --ext for mapping custom extensions, see #438
• cmd: improve --match/--include/--exclude patterns parsing
• cmd: remove --mime in favor of --type