There was a known issue for a long time that we occasionally encountered strange "TypeError: an integer is required" and "RuntimeWarning: tp_compare didn't return -1 or -2 for exception", as shown in the following unit test log. The source of the former error was PyInt_AsLong(obj) being used by IntegrationType_from_BPy_IntegrationType(obj), where "obj" was not properly initialized in "__init__" before the converter was called. The TypeError was left unattended for a while and showed up when a comparison occurred and the TypeError was detected, which resulted in the latter warning. > runTest (__main__.UnaryFunction1DDoubleInitTestCase) ... > .\blender:211: RuntimeWarning: tp_compare didn't return -1 or -2 for exception > ERROR > > ====================================================================== > ERROR: runTest (__main__.UnaryFunction1DDoubleInitTestCase) > ---------------------------------------------------------------------- > Traceback (most recent call last): > File "init_tests.py", line 211, in runTest > TypeError: an integer is required > > ---------------------------------------------------------------------- * Also removed unnecessary error messages in "__init__" methods of UnaryFunction1D types.