[NTG-context] start/stopregister

Hi all, has \startregister been superseded in luametatex or is it not yet implemented? I tried to read strc-reg.lmt but couldn't figure out what is going on. The following silly minimal test produces the expected result with mkiv but not in mkxl. All best Thomas \setuppapersize [A6] \starttext A\index{A} B\startregister [index] [B] {B} \dorecurse {10} {\input tufte} A\index{A} B\stopregister [index] [B] \page \placeregister[index] \stoptext