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I want to warn against the converting of base objects (whose sources lie in Objects/). Their performance is critical and the converting can worsen it. Often they even don't use PyArg_ParseTuple due to performance reasons or because argument parsing is too special for PyArg_ParseTuple. I would suggest to postpone it until Argument Clinic will generate optimized parsing code.
The same is true for some modules. The performance of struct and operator is important. In any case these modules almost not use PyArg_ParseTuple and can be omitted.