}

  @Test fun disallowedStd3Valid() {
    assertThat("_".map()).isEqualTo("_")
    assertThat("/".map()).isEqualTo("/")
    assertThat("≠".map()).isEqualTo("≠")
  }

  @Test fun disallowedStd3Mapped() {
    assertThat("\u00b8".map()).isEqualTo("\u0020\u0327")
    assertThat("⑴".map()).isEqualTo("(1)")
  }

  @Test fun outOfBounds() {
    assertFailsWith<IllegalArgumentException> {