@timperrett ReaderT[A, M[_], B] = A => M[B]. Bazillions of uses; one is composition for Monad[M], (A => M[B]) => (B => M[C]) => (A => M[C])
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@timperrett ReaderT[A, M[_], B] = A => M[B]. Bazillions of uses; one is composition for Monad[M], (A => M[B]) => (B => M[C]) => (A => M[C])