garbage?

# File activesupport/lib/active_support/core_ext/hash/conversions.rb, line 241
      def garbage?(value)
        # If the type is the only element which makes it then
        # this still makes the value nil, except if type is
        # an XML node(where type['value'] is a Hash)
        value["type"] && !value["type"].is_a?(::Hash) && value.size == 1
      end