When Radix_parent function returned Py_NONE, there was no corresponding
Py_INCREF call. Hence, at some point Python crashed trying to deallocate
None object.
Coverage remained the same at 90.33% when pulling 0b60e2f0950f90864c3dfae84cbdeb8bcb1584b2 on refcount into ee5eed4db63913d10a1339bff011de8bd64cb08a on master.
When Radix_parent function returned Py_NONE, there was no corresponding Py_INCREF call. Hence, at some point Python crashed trying to deallocate None object.