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On Windows x64, we get the following warning:
..\Objects\codeobject.c(106): warning C4244: '=' : conversion from 'Py_ssize_t' to 'unsigned char', possible loss of data [C:\buildbot.python.org3円.x.kloth-win64\build\PCbuild\pythoncore.vcxproj]
Code:
 unsigned char *cell2arg = NULL;
 Py_ssize_t total_args = argcount + kwonlyargcount +
 ((flags & CO_VARARGS) != 0) + ((flags & CO_VARKEYWORDS) != 0);
 PyObject *cell = PyTuple_GET_ITEM(cellvars, i);
 for (j = 0; j < total_args; j++) {
 PyObject *arg = PyTuple_GET_ITEM(varnames, j);
 if (!PyUnicode_Compare(cell, arg)) {
 ====> cell2arg[i] = j; <===== HERE
 used_cell2arg = 1;
 break;
 }
 }
total_args is not checked for being smaller than 256.
Related issue: #9566.