PyDTrace_GC_DONE() accepts the argument of type int. But it is called with the sum of collected and uncollectable objects which has type Py_ssize_t and can be larger that maximal int.

This produces a compiler warning on Windows:

..\Modules\gcmodule.c(978): warning C4244: 'function': conversion from 'Py_ssize_t' to 'int', possible loss of data [D:\buildarea\3.x.bolen-windows10\build\PCbuild\pythoncore.vcxproj]

and looks as not false alarm.