If I remember correctly, the enable_faulthandler.py can't be used as a pythonista_startup.py directly (by default the faulthandler script is meant to be importable, so it doesn't run when loaded). This gist contains the faulthandler script as a working pythonista_startup.py. (The faulthandler prints a message in the console when it runs, so you can tell when it's working correctly.)
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