I once heard a joke about a team in an unnamed bank that was interfacing with the mainframe using the latest and greatest JavaScript framework of the time. Once they were full speed in production, bug reports started to pop up. They tried solving them one by one until some brave soul reminded them that JavaScript has only one way to represent numbers and it happens that the JavaScript way is totally unfit for monetary calculations.

P.S. As much as I hate DEC64, it is a much better way to handle money. Someone please add DEC64 to JavaScript! We have Set and generator functions. Why not another way to store floating point numbers!