Hi Hans, Hi Taco, Hi all,

a couple of days ago I complained about not adapted delimiters around
constructions with \atopwithdelims.
With LuaTeX, Version beta-0.41.0-2009070222 (Web2C 2009), this
problem persists. After reading the last luatexref-t.pdf I tried following:

\starttext
\Ustartmath\Ustack {a \atopwithdelims() b}\Ustopmath
\startformula
\Ustack {a \overwithdelims[] b}
\stopformula
\stoptext

Greetings Lutz