STINNER Victor added the comment:

In Python 3.5, PyObject_CallFunctionObjArgs() calls objargs_mktuple() which 
uses Py_VA_COPY(countva, va) and creates a tuple. The tuple constructor uses a 
free list to reduce the cost of heap memory allocations.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28870>
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