exception in objc.object_property.setter can trigger systemerror?
I've noticed problems like this:
Traceback (most recent call last): File "PyObjCTest/test_array_property.py", line 151, in testGetSetSlice o.array = l SystemError: error return without exception set
This appears to be triggered by an exception in a property setter, but only using the pyobjc property class, not regular properties.
This points to a bug in C code (either PyObjC itself or Python, with the former being more likely).