The bool function is if/then/else with the arguments around the correct way.
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Oh, yeah, I agree that is consistent with other commonly used folds. However, I still feel that the "one true way" is for all folds to take the value to be folded first so that each fold is a morphism in the isomorphism between a value and its Church encoding
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guys, what does consistency buy you? Come bask in the wonders that are Scala `fold[B](ifEmpty: ⇒ B)(f: (A) ⇒ B): B` `def fold[C](fa: (A) ⇒ C, fb: (B) ⇒ C): C`
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