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If you don't use the slot decorator, the signal connection mechanism has to manually work out all the type conversions to map from the underlying C++ function signatures to the Python functions.

The document outlines best practices for integrating C++ with QML in Qt, emphasizing the model-view pattern, property creation, and invokable methods.

Qt offers two different ways to write signal-slot connections in C++: The string-based connection syntax and the functor-based connection syntax.