"why should i understand how to write Functor instances when, if you'd told me about the GHC extension, i could just derive them?"pic.twitter.com/JvggApJU7q
Well, because sometimes when you derive the Functor, you get the wrong one, or that performs poorly.
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what's an example of the wrong one?
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I am only familiar with the poor-performing one. By "wrong" I mean, "maybe not the one you want."
End of conversation
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in this case, he was surprised by its behavior, although if he understood Functor at all, he wouldn't have been. *sigh*
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An uninformed, opinionated programmer? Get outta here, never happens.
End of conversation
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