 Sum a collection of MixedAmounts.
maSum :: Foldable t => t MixedAmount -> MixedAmount
maSum = foldl' maPlus nullmixedamt

--
maSum :: Foldable t => t MixedAmount -> MixedAmount
maSum = foldl' maPlus nullmixedamt
maSum = foldl' maPlus nullmixedamt