Which one of the following would give more debugging information?

• Urgent
• Severe
• Fatal

Not necessary that evident, especially to the guy who is going to maintain your code.

OTOH, a simple guess would reveal that debug level 3 should probably give more debugging info than level 2.

And nothing stops you from introducing debug levels 2.5 and 2.6 later on, should that prove necessary.

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Everything will go worng!