[NTG-context] Framed flush bottom

Dear list, According to the wiki page for \setupalign "height" Fill the height: press the last line's baseline against the lower boundary. but that doesn't see to work in framed. How can I get the interline space stretched to flush to the bottom? MWE is below. Cheers, Henri --- \starttext \startframed[width=\textwidth,height=\textheight,align={width,height}] \input knuth \input knuth \stopframed \stoptext