Hi all,

is it possible to subtract a featureset that has been applied to a fontfamily? MWE:

\definefontfeature
  [f:frac]
  [frac=yes,onum=no,pnum=no]

\definefontfeature
  [f:onum]
  [onum=yes,pnum=yes]

\definefontfamily [test] [serif] [AntykwaTorunska] [features=f:onum]
\definefontfamily [test] [sans]  [Myriad Pro]
\definefontfamily [test] [mono]  [DejaVu Sans Mono]
\definefontfamily [test] [math]  [Xits Math]

\setupbodyfont[test,12pt]

\starttext

Mozarts erster Satz ist ein
{\subtractfeature[f:test]\addfeature[f:frac]4/4}-Takt, Beethoven wählt einen Dreiertakt, Mozarts Romanze ist ein 3/8-Takt, Beethoven wählt einen 2/4, Mozarts Rondo ist eine Gavotte im 2/2-Takt, Beethoven schreibt ein Jagdrondo im 6/8-Takt.

\stoptext

If I comment out the part [features=f:onum], I get the fractions that I'm looking for, but it seems that I can't get the same effect with \subtractfeature and \addfeature. I'm confused...

Thanks and all best

Thomas
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