Thanks! Need to do a bit more massaging then will explain the changes I'd like to make, but would be great to get this in for v3.

Things I've tweaked before merging:

• Don't deprecate/rename underline and related utilities, I understand the desire for consistency here but I don't think the value outweighs the cost since these are commonly used, referenced in blog posts, tutorials, etc.
• Remove text-underline-position utilities, this seems to have questionable browser support and would require a lot of investigation to know exactly what we should support for sure — can always add this in the future when have more time to really understand the support
• Remove DEFAULT values for thickness/underline-offset — I think a utility just called decoration adding a 1px underline isn't super clear, to me it is logical for borders but not as much here, same thinking for underline-offset as a utility
• Add auto and from-font values to thickness utility — just added these for completion's sake + responsive undoability
• Add auto to underline-offset utility — for undoability