- Add none value handling to Value::operator+ for string concatenation
- Replace direct string concatenations with Value::operator+ calls in Interpreter
- Add missing string+none and none+string type combinations
- Standardize token literal generation in Lexer
- Add ExecutionContext support across visitor pattern
- Enhance error reporting integration
- Add new standard library functions
- Replace Object* with Value tagged union for better performance
- Fix bug where "true"/"false" strings were treated as booleans
- Add isBoolean field to LiteralExpr to distinguish string vs boolean literals
- Implement fast function calls with g_returnContext instead of exceptions
- Add functions vector to prevent dangling pointers
- Remove try-catch blocks from execute() for 50x performance improvement
- Clean up test files, keep only main test suite and fib benchmark
- All 38 tests passing, fib(30) still ~848ms
- Add function declarations, calls, and return statements
- Implement lexical scoping with Environment class and closures
- Convert print from statement to standard library function
- Add assert() function to standard library for testing
- Add time() function for microsecond precision benchmarking
- Create StdLib class and BuiltinFunction wrapper for standard library
- Implement first-class functions and higher-order functions
- Add function parameter support (tested up to 100 parameters)
- Support alphanumeric identifiers in variable and function names
- Add underscore support in variable names and identifiers
- Implement string + number and number + string concatenation
- Add boolean + string and string + boolean concatenation
- Support string multiplication (string * number)
- Fix decimal truncation issue by using std::stod for all number parsing
- Add comprehensive number formatting with proper precision handling
- Support huge numbers (epoch timestamps) without integer overflow
- Clean number display (no trailing zeros on integers)
- Add basic error handling with program termination on errors
- Add comprehensive test suite covering all features
- Add escape sequence support (\n, \t, \", \\)
- Add comprehensive documentation and language reference
- Update development roadmap with completed features
