Provide a first class Decimal class to allow arbitrarty precision decimal types that support monetary mathematics.

[DamianReeves]

Floats are not ideal for monetary calculations as they are not precise. It would be beneficial if Pkl included a decimal type to help with not only specifying decimal types, (which is fairly easy to do), but also providing decimal mathematics (which is a bit more difficult to get right on the user side).

[bioball]

We've considered a Fractional in the past, which is more precise than Decimal. Would allow you to express things like 2/3. In that case, decimal would simply be fractional whose base is 10, 100, 1000, etc.

[DamianReeves]

I think this would be fine given a way to render the fractional as a decimal string.