def method_missing name, *values, &block
      return @_confs.send( name, *values, &block ) if @_confs.respond_to? name     # @_confs methods are highest priority
    end
def method_missing name, *values, &block
      return @_confs.send( name, *values, &block ) if @_confs.respond_to? name     # @_confs methods are highest priority
    end
protected :_confs