One surprising thing I've learned from having kids is how deep completism runs in humans. (All toy companies know this.)
A child with strong completist tendencies is also likely to be (or to become) a passionate "rules lawyer." Rules define membership.
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The evolutionary value of a knack for abstraction and precision may not be so obvious as that of, say, acute vision. But still.
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The demands of abstraction and precision drive the refinement and extension of language, whose evolutionary value surely is obvious.
End of conversation
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