- Insert block argument patterns: `fields { block }`, `fields {|a, b| block }`, and variants with parentheses
- Add all infix operators (+, -, *, /, %, <, >, <=, >=, ==, !=, &, |) and prefix operators (!, ~, -) with string return values
- Fix class name capitalization from `literals` to `Literals` and update comment formatting for consistency
- Modify unicode escape example string to include extra characters between code points