  Recent studies of several multi-body $D^0$ meson decays have revealed that
the final states are dominantly $CP$-even. However, the small value of the
width difference between the two physical eigenstates of the
$D^0$-$\overline{D}{}^0$ system indicates that the total widths of decays to
$CP$-even and $CP$-odd final states should be the same to within about a
percent. The known contributions to the width difference from hadronic $D^0$
decays are discussed, and it is shown that an apparent excess of
quasi-$CP$-even modes is balanced, within current uncertainty, by interference
effects in quasi-flavour-specific decays. Decay modes which may significantly
affect the picture with improved measurements are considered.
