How to use large decimal numbers with fixed precision, like money amount, in emacs lisp? For example, I'm writing a function that takes amount of money as a parameter. When I pass large float like 999999999999999.01 it looses precision and becomes 999999999999999.0. I didn't find fixed type in manual. My workarounds are:

1. Pass two integers separately, integer part and fraction part - like dollars and cents
2. Pass amount as string and parse it to two integers,

but both of this approaches will be less convenient for users.