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So you'd be unwilling to discuss a major library that you've used in your career (say Spring, or Rails) with a potential employer?

The "filter" I'm looking for is to weed out people who cannot crack open the source to something that is standing between them solving a problem. I'm not asking them to be an expert on the internals of everything they use. Apologies if my comment was unclear.

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Generally major libraries have actual documentation that's good enough to make it counter-productive to look at the source. If you simply asked if there was ever a time where you needed to look at the source for a library, I could probably come up with something. However, I've never had to look at the source for anything that I would consider a "major" library because everything that I've used that I would consider a "major" library has decent documentation.

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