Vorbis dev - Feb 2007 - Non-monotonic mode max bitrate limits in libvorbis?

Hi,

Just wondering: it seems that the max bitrate limit for ~22k mode is
lower than the one for ~16k mode?

static double rate_mapping_22_uncoupled[4]={
  16000.,28000.,50000.,90000.
};

vs.

static double rate_mapping_16_uncoupled[4]={
  16000.,28000.,64000.,100000.
};

A mistake, or is there a reason?

Arek