matsen/pplacer — comment on commit 4bdb88051f99e897263bb26da6f55238a387f7f5
File: pplacer_src/voronoi.ml line 665
By habnabit:

Changing that criterion causes voronoi to not find the most-optimal solution (which I just verified). I remember there being a specific reason for this, but I don't remember _what_ it was.