From a quick test it looks like it supports exponents up to 9 digits long (i.e. 1.0e999999999), which, frankly, seems pretty reasonable; it's hard for me to ima

From a quick test it looks like it supports exponents up to 9 digits long (i.e. 1.0e999999999), which, frankly, seems pretty reasonable; it's hard for me to imagine a use case where you'd want to represent numbers larger than that.