Implement a better way to represent fractional values

[jverkoey]

Many Tailwind CSS utilities support expressions like 1/2 or 3/4 to represent fractional values. For Slipstream modifiers that support fractional values, Slipstream currently treats any value between 0..<1 as a potential fractional value. So 0.25 will be treated as 1/4.

This is a bit of a hack, isn't super intuitive, and unfortunately due to compiler limitations does not let the developer use the more natural 1/4 to represent the fraction.

A better solution is not immediately apparent, so I'm filing this issue to track the desire for an improvement here.