@Test
  void configKeyUsesChildType() throws Exception {
    assertThat(Feign.configKey(List.class, Iterable.class.getDeclaredMethod("iterator")))
        .isEqualTo("List#iterator()");
  }
The type of a parameter value may not be the desired type to encode as. Prefer the interface
type.
core/src/test/java/feign/AsyncFeignTest.java