def setup_renderer(renderer)
      renderer.default_assigns = liquid_assigns if respond_to?(:liquid_assigns, true)
      renderer.default_registers = liquid_registers if respond_to?(:liquid_registers, true)
      renderer.default_filters = liquid_filters if respond_to?(:liquid_filters, true)
    end
def setup_renderer(renderer)
      renderer.default_assigns = liquid_assigns if respond_to?(:liquid_assigns, true)
      renderer.default_registers = liquid_registers if respond_to?(:liquid_registers, true)
      renderer.default_filters = liquid_filters if respond_to?(:liquid_filters, true)
    end
Sets the values of +default_assigns+, +default_registers+ and +default_filters+ on a given
 renderer using the +liquid_assigns+, +liquid_registers+ and +liquid_filters+ methods, if
 they're defined.