[NTG-context] What is "cutspace" and "bottomspace"?

Dear List, according to https://wiki.contextgarden.net/Command/setuplayout , "cutspace" and "bottomspace" are the counterparts of "backspace" and "topspace", and "If cutspace is set to 0, it is taken to be equal to the backspace". But in fact, the following document stays the same no matter what value is given to cutspace. \setuplayout[cutspace=0.01cm] \starttext x \showframe \stoptext Has anyone actually used these two parameters? Best, Sylvain