Hmmm? 

b My::App::some_function $_[3] > 999

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Sets the breakpoint on My::App::some_function only if the 4th argument is numerically larger than 999. Similar structure for line breaks: 
b 215 $i > 999

[download]
I use it all the time. It's invaluable.

In reply to Re^4: I never use the debugger. by Tanktalus
in thread I never use the debugger. by friedo

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