it should still fix some issue Because SingleOrDefault would require it to generate SQL which ensures that there is not more than 1 foreign row. Essentially, it would have to create a join which returns no rows if the count > 1 FirstOrDefault, however, simply allows it to generate a join and SELECT TOP 1 (or equivalent) which is vastly easier.
this one helps. The windll module automatically catches windows SEH exceptions which occur in calls, and converts them to WindowsError python exceptions. Hence they are not unhandled exceptions. You need to use an API which doesn't have such a good wrapper.
What signal does the JVM raise during an unhandled exception?
I wish this help you Unhandled exceptions don't necessarily cause the JVM to raise a signal - it isn't necessary: the exception is caught by the Java system code and handled there (prints a stack trace and exits for instance). There may be cases in which JVMs raise a signal in order to invoke a signal handler to log further diagnostic information.