Facet count of zero

[Tod]

I'm trying to exclude certain facet results from a facet query.  It 
seems to work but rather than being excluded from the facet list its 
returned with a count of zero.

Ex: 
q=(-foo:bar)&facet=true&facet.field=foo&facet.sort=idx&wt=json&indent=true

This returns bar with a count of zero.  All the other foo's show up with 
valid counts.

Can I do this?  Is my syntax incorrect?



Thanks - Tod