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    That's because there's nothing to test (a null is passed in), which makes it vacuously true.

    If I say "all CW users who are 2dan are aliens", that'd be true because there are currently no users who are 2dan.

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    What is good to read up on about those "___" and "->" symbols? I don't even know what they are called. I'm not understanding how both "allMatch(null, __ -> true)" and "allMatch(null, __ -> false)" could both be true.