[NTG-context] \high{} in mkiv

Hi all (Hans!), I have a problem with the \high{} command in mkiv: in most of my typescripts, I have the onum feature set for my base fonts. When I have a number with two digits within the \high command, I get the expected oldstyle numbers; with one-digit numbers, the number is regular (not oldstyle). Since I know that this sounds completely ludicrous, I attach a small pdf example. It's set in Adobe Garamond, and the source is: A\high{1} A\high{2} A\high{12} Why is the onum feature lost for single-digit numbers? I'm completely lost here, can anyone help? Thanks, and best Thomas