rainbow
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Add two styles `underline2x` and `overline`
See https://en.wikipedia.org/wiki/ANSI_escape_code#SGR_(Select_Graphic_Rendition)_parameters
- I choose the word
overline
rather thanoverlined
because our API isunderline
rather thanunderlined
. - I choose the word
underline2x
rather thandoublely_overlined
because it's complicated, and we can switch betweenunderline
andunderline2x
easily.
This is the screenshot on Windows Terminal: