Steal fractional exponents from Libra

[erikerlandson]

Don't try to stop me.

[zainab-ali]

Go ahead! They were pretty fun to implement.

[erikerlandson]

I'm interested in consuming this by way of something like fthomas/singleton-ops#140, if singleton-ops maintainers are interested

[erikerlandson]

Currently thinking of supporting rational unit exponents for scala 3, going forward.
Here is a prototype run-time and type-level implementation of Rational in Scala 3, using the new macros

https://github.com/erikerlandson/poc-coulomb-scala3/blob/59ba500f81d1f92c4a6a0f21e22921497eab84a7/coulomb/src/coulomb/infra/rational.scala

This also moves toward the possible goal of removing dependency on spire and singleton-ops

[ryan-richt]

+1 for fractional exponents! These arise frequently in using your MKS units, at least for us 🤣. Awesome library, thank you

[erikerlandson]

@ryan-richt I have fractional exponents working on my Scala 3 prototype, which I am hoping to get back to soon...

[erikerlandson]

These appear to be working well on the scala-3 branch, so I'll consider this closed by the eventual scala-3 release
https://github.com/erikerlandson/coulomb/tree/scala3