- Add support for array references using byRef flag in ArrayExpressionTrait
- Modify hasReference check in array parsing logic to handle mixed references
- Implement reference value parsing with proper error handling for unpacking
- Enhance foreach reference binding with improved type checking and error messages
- Add proper scope handling for foreach iterators with class context
- Update foreach value assignment to use correct reference expression syntax
- Implement structural mutation protection for std containers during iteration
- Add comprehensive test coverage for foreach edge cases and reference mutations
- Document std container modification restrictions during foreach loops
- Update yield from and foreach documentation for iterator handling differences
