Worked on the pytest-dev/pytest repository to enhance the reliability and maintainability of numeric assertions and test discovery. Addressed a critical bug in Python by refining the approx function to correctly handle comparisons between Python bool and NumPy bool_ types, ensuring consistent behavior across environments. Developed targeted tests in Python to validate this fix and expanded coverage to reduce edge-case flakiness for NumPy users. Additionally, improved documentation written in reStructuredText by providing an example of using mixin classes for automatic collection of abstract test subclasses. These contributions strengthened CI stability and offered clearer guidance for maintainers working with pytest.