How to call functions that return tuples?

Does multicall allow for tuple return types? On [line 63 of aggregate.js](https://github.com/makerdao/multicall.js/blob/779915fa049b68ecc2f6bbf17b68946cc7e32769/src/aggregate.js#L63), the call return types are comma-delimited with no exceptions, so I don't know how to format the call string to account for tuples.