7.4

## exact-decimal-lang

source code: https://github.com/AlexKnauth/exact-decimal-lang

#lang exact-decimal | package: exact-decimal-lang |

The exact-decimal language is a lang-extension like at-exp
that reads decimals as exact rationals.

For example, #lang exact-decimal racket/base
is a language like racket/base, except that for example
0.1 reads as 1/10. You can still specify inexact numbers with
#i though.

produces 1/10