Which is not bad if that floating point type is decimal. All of your integers do what they're supposed to. In addition, things like the standard programming fail of using "i += 0.1;" as a loop iterator actually work when you use decimal floating point.

Also, things like converting to/from strings become operations with a priori bounded limits just by taking a quick look at the number of digits if you have decimal floating point.

This is not true for binary floating point. There is a reason why printf libraries are so blasted huge and have malloc issues--it's the binary floating point conversions.

Much of the stupidity we encounter in dealing with floating point (inexact numbers on exact decimals, silly rounding, inability to handle significant figures, weird conversion to/from strings) simply goes away if you use decimal floating point.

In addition, if you go back through the ECMAScript archives, they actually thought about this back in ECMAScript4 but rejected it for some good reasons. I don't agree with those reasons, but they did think about and discuss them.