Subclasses stomp on superclass fields with the same name breaking the field for other subclasses

[RickMoynihan]

      class Base
        include Tripod::Resource
        field :inherited, RDF::RDFS::label
      end

      class Foo < Base
        # expects inherited to be RDF::RDFS::label
      end

      class Bar < Base
        field :inherited, RDF::URI.new("http://stomp/over/inherited/field")
      end

Foo.fields[:inherited].predicate.to_s ;; => "http://stomp/over/inherited/field"

(should be RDF::RDFS::label)

[RicSwirrl]

Cheers for the bug report.