because not everyone knows. Most lisps can handle fractional numbers as actual fractional numbers without the BS floating point rounding. 1/3 of 100 For exampl

because not everyone knows. Most lisps can handle fractional numbers as actual fractional numbers without the BS floating point rounding. 1/3 of 100 For example, is 33.333 repeating. Most languages and databases will round this off at some point. Most lisps are perfectly happy with the idea of fractions and thus circumvent this problem entirely, at least, until you need to interface with some other brain damaged system or need to give someone physical cash money. If you're dealing with money, you should seriously consider using a lisp.