The suggested plan of attack and documented test strategies on https://py-free-threading.github.io are up-to-date given what we know and the tools we have available. However, the testing strategies for uncovering thread-safety issues are falling short of what we need. Improving this should be a priority.

Ideas that need implementing or protyping:

• create a decorator to easily run a pytest test case in parallel (can be based on the test patterns for threading and concurrent.futures in this doc section, and look something like the run_in_parallel from scikit-image)
• a pytest plugin to all tests in a full test suite in parallel (e.g. using the decorator from the task above)
• use ThreadSanitizer on a Python package (it has proven useful for CPython)
  • set up for NumPy and figure out how useful it is (what does it catch, what's the false positive rate)
  • document how to do this with Meson and CMake