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Looking into improving the flakiness of some of the subshell tests, hoping to fix #1359.
The failures in CI all appear on Windows, either CPython 3.11 or PyPy. On a local Windows machine the tests pass for my using CPython 3.11 but I can reproduce the failures with PyPy 3.9. Increasing the timings of the tests so that the timing variability is proportionately smaller works for me locally, so trying it here in CI.