[NTG-context] Getting page width and height in Lua

[Jack Steyn]

If I want to get the paper width and height to use in some Lua code, I can
use:

local paperwidth, paperheight =
backends.pdf.codeinjections.getpagedimensions()

But what if I want to get the page width and height? That is, the width and
height of the first argument in the two-argument version of
\setuppapersize. Does anyone know how I can obtain these using Lua?

Many thanks,

Jack
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