I am asking because the spaces don't collapse for me with LuaMetaTeX 2.11.08
(level 20250917):
(global macro:{h␣␣ello} )
(global macro:world␣)
[h␣␣ello␣␣world␣]
For
{h ello}
world
I am assuming that's part of the unreleased fix, i.e. your "patched version of
\read" then?
Best,
Vit
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