Natanael Sirqueira

Add tooltip to inputs with validation errors

5

The form validation errors are not shown anywhere. It looks like we're missing a tooltip on the input icon. 

Rational Numbers: Add error test case to expreal property

4

As suggested by @jiegillet in [gleam!248](https://github.com/exercism/gleam/pull/248#discussion_r1121615055), we would like to add a failure edge case when doing the exponentiation of a real number to a rational number.