[Python-Dev] Proliferation of tstate arguments.

Hi, There seems to be a proliferation of `PyThreadState *tstate` arguments being added to API and internal functions. These changes are listed under https://bugs.python.org/issue38644. I think that these changes are misguided. The desired results can be achieved more reliably and more simply in other ways. The changes add bulk to the C-API and may hurt performance. These changes are also causing a lot of churn and merge conflicts (for me at least). So can we please stop making these changes, at least now? Changes on this scale merit a PEP and proper discussion, rather than being added piecemeal without proper review. Cheers, Mark.