Geospatial searches with Solr (websolr) in Rails 3.x

Question

I am looking to utilize Solr for both text and geospatial searching in a Rails 3.1 app. I see that websolr supports geo-spatial indexing & searches but the two gems for it (sunspot & rsolr) do not seem to (currently) implement it. Sunspot appears to be in the process of adding the functionality but claims that "[geospatial is] experimental and unreleased. The DSL may change."

Are there other implementations of geospatial searching with sunspot + websolr? I've done a bit of googing and come across some but they seem hackish and I'd rather not use what I've found if there is already a core feature being baked in or a more supported approach.