..

and [here](https://github.com/transmissions11/solmate/blob/main/src/tokens/ERC1155.sol#L145) and [here](https://github.com/transmissions11/solmate/blob/main/src/utils/FixedPointMathLib.sol#L177) and [here](https://github.com/transmissions11/solmate/blob/main/src/utils/FixedPointMathLib.sol#L189)