assertThat(request.tag(UUID::class.java)).isSameAs(uuidTag)
    assertThat(request.tag(String::class.java)).isNull()

    // Alternate access APIs also work.
    assertThat(request.tag(UUID::class)).isSameAs(uuidTag)
    assertThat(request.tag<UUID>()).isSameAs(uuidTag)
  }

  @Test
  fun kotlinReifiedTag() {
    val uuidTag = UUID.randomUUID()
    val request =
      Request
        .Builder()