randalcatSet = rfc3491.randalcatSet,
      lcatSet = rfc3491.lcatSet,
    )

  @Test fun mappedToNothing() {
    assertThat(stringPrep("a\u00ADz")).isEqualTo("az")
    assertThat(stringPrep("a\u200Dz")).isEqualTo("az")
  }

  @Test fun caseFolding() {
    assertThat(stringPrep("localhost")).isEqualTo("localhost")
    assertThat(stringPrep("Localhost")).isEqualTo("localhost")