tuplet fraction bug

[David Bobroff]

In this example below I'm getting results that I think are wrong.  
Possibly I'm doing something wrong.  If so, please let me know.  I'm
coding a piece which uses some odd tuplets.  In the manuscript they are
indicated as x:y in a bracket.  This is working.  But, I think the
numbers in the output need to be reversed.  I added a triplet on the
first beat to illustrate the point.  With a triplet I would expect to
see 3:2 meaning "three notes in the space of two."  In the last two
beats of this measure there should be a total of 7 16ths in the space of
8.  This is being notated properly as far as the notes and beams are
concerned, but again, I would expect the fraction to be 7:8 (seven 16ths
in the space of 8)

In short, shouldn't \times x/y {notes} produce y:x over the {notes} in
the output?

This is on v2.1.28.hwn1.

-David

\score {
    \notes \relative c { 
        \set Voice.tupletNumberFormatFunction = #fraction-tuplet-formatter
        \clef F
        \time 3/4
        \times 2/3 { c8 f a} \times 8/7  {r16 b! c, e! bes d,! fis'}
 }
    \paper { }
}