scala 3 support for core + refined

[bplommer]

Codec.deriveEnum and Codec.deriveFixed had to be made specific to scala 2, because they depend on TypeTag - I'll look into bringing them back using typename as mentioned in #238, though I do wonder whether we shouldn't move autoderivation out into a separate module anyway.

Had to disable scoverage because it doesn't support dotty, but might be able to re-enable it for scala 2

[vlovgr]

@bplommer my thinking is we could move all the Codec.derive* functions to the generic module.

[bplommer]

@bplommer my thinking is we could move all the Codec.derive* functions to the generic module.

Sounds good. Let's initially copy/alias them there and deprecate them in core?

[vlovgr]

@bplommer my thinking is we could move all the Codec.derive* functions to the generic module.

Sounds good. Let's initially copy/alias them there and deprecate them in core?

Yes, let's have at least one round of deprecation before removing them in the next major release. 👍

[bplommer]

The only thing blocking this is sbt-scoverage, which shows no signs of planning to support scala 3. Ideally we'd continue to report coverage for scala 2, but that's going to require quite a lot of refactoring of the build. What do you think about dropping it for now @vlovgr ?

[bplommer]

I'm tempted to deprecate Codec.enum in favour of Codec.enumeration to avoid the issue with enum being a keyword in scala 3 - thoughts?

[vlovgr]

What do you think about dropping it for now @vlovgr ?
👍

I'm tempted to deprecate Codec.enum in favour of Codec.enumeration to avoid the issue with enum being a keyword in scala 3 - thoughts?

Is enum a soft or hard keyword? If it's a hard keyword, then we should definitely do this.

[bplommer]

Is enum a soft or hard keyword? If it's a hard keyword, then we should definitely do this.

Hard. I'll make that change.

[bplommer]

@vlovgr shall we merge this and follow up with another PR to move deriveEnum to vulcan-generic?

[vlovgr]

@vlovgr shall we merge this and follow up with another PR to move deriveEnum to vulcan-generic?

Sounds good to me.