"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
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Replying to @argumatronic
Well, because sometimes when you derive the Functor, you get the wrong one, or that performs poorly.
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Replying to @dibblego @argumatronic
what's an example of the wrong one?
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Replying to @puffnfresh @argumatronic
I am only familiar with the poor-performing one. By "wrong" I mean, "maybe not the one you want."
5:56 PM - 20 Feb 2017
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