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On Mon, Feb 22, 2021 at 6:00 AM Soni "They/Them" L. wrote:
       local foo = "USAGE\n\z
                    \    description."

Why do you want to put such unpleasant-looking thing in your code?
Lua offers much nicer variant:

local foo = [=[

If you want to indent it:

      local foo = ([=[
            \    description.]=])
      :gsub("%f[^\n%z][ \t]*\\", "")

Please note that the text is more easily readable because you don't see all that \n\z-garbage.

IMO, "\z" is a good option for long strings of data (kilobytes of hexadecimal digits).
But for human-readable text the preferred option is long brackets.