Rubinius messes up Term URIs

[gkellogg]

Consider the following:

RDF::URI("http://www.w3.org/2000/01/rdf-schema#subPropertyOf").inspect
 => "#<RDF::URI:0x2b384 URI:http://www.w3.org/2000/01/rdf-schema#subPropertyOf>"

but

RDF::RDFS.subPropertyOf.inspect
 => "#<RDF::Vocabulary::Term:0x2b528 URI:["http://www.w3.org/2000/01/rdf-schema#subPropertyOf"]>" 

For some reason, an array value is creeping in there, even though Term is just a subclass of URI.