- Added complete type annotations to all functions, parameters, and return types
- Added runtime type checking function _check_type() that enforces strict typing
- All functions now validate parameter types and raise TypeError if incorrect
- Added comprehensive docstrings explaining type requirements
- Module header variable now has explicit type annotation
- Tested both normal operation and type error detection
Co-authored-by: johndoe6345789 <224850594+johndoe6345789@users.noreply.github.com>
