Description
at least one user has gotten confused by doing a serach like this...
http://localhost:8983/solr/shop/select/?indent=on&facet=true&sort=prijs%20ASC&start=0&rows=18&fl=id,prijs,prijseenhe
id,artikelgroep&q=:&facet.field=artikelgroep&facet.mincount=1
and getting this error...
Can't determine Sort Order: 'prijs ASC', pos=5
... i can't think of any reason why it would be bad to accept both uppercase and lowercase versions of "asc" and "desc"