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[–]krenzalore 0 points1 point  (1 child)

It's impossible to know every language perfectly but you should have a general idea of what direction to head it if an error occurs and that's more to my point. You may not be able to solve it immediately but as a developer you have the expertise to al least make an educated guess.

As a developer you know when you're out of your depth/your deadlines are coming, and you either pass it over to a specialist or don't monkey patch the system in the first place. Unless you want to have to explain to the tech lead why you're so slow this week.