def linearized?
            begin
                first_obj = @revisions.first.objects.min_by{|obj| obj.file_offset}
            rescue
                return false
            end

            @revisions.size > 1 and first_obj.is_a?(Dictionary) and first_obj.has_key? :Linearized
        end
def linearized?
            begin
                first_obj = @revisions.first.objects.min_by{|obj| obj.file_offset}
            rescue
                return false
            end

            @revisions.size > 1 and first_obj.is_a?(Dictionary) and first_obj.has_key? :Linearized
        end
Returns whether the current document is linearized.