Yet another attribute to look for in the serializer 😱 🤣

LGTM 👍

This implementation does not apply the underline color to the overline and it does not "dodge" the text like underline does. This is simpler and it's ambiguous whether that should happen anyway.

About the color:
Imho using FG color is the only useful option atm, underline color is explicitly defined for underline, but we have nothing like that for overline (plz lets not open Pandora's box here and add another color setting for a rarely used attribute).

About overline cutting through glyphs:
Actually this might help to get an easier distinction from underlines above. Also the use cases in the WT thread suggest this as a visual help for things like a status line - here a "hard border/line" cutting through glyphs might help to get the wanted visual separation.