- Implement static type validation for union, intersection, and nullable types
- Add composite type assignment checking for parameters, return values, and property assignments
- Introduce dynamic value wrapper tests to verify type checking behavior
- Enhance error messaging for composite type mismatches
- Update documentation to reflect improved static type analysis capabilities
- Add proper restoration of compiler state after generator conversion errors
- Improve parallel compilation process management and error handling
- Add metadata caching for object files with PHP ABI compatibility checks
