assertThat(SignedBytes.join(",", ARRAY1)).isEqualTo("1");
    assertThat(SignedBytes.join(",", (byte) 1, (byte) 2)).isEqualTo("1,2");
    assertThat(SignedBytes.join("", (byte) 1, (byte) 2, (byte) 3)).isEqualTo("123");
    assertThat(SignedBytes.join(",", (byte) -128, (byte) -1)).isEqualTo("-128,-1");
  }

  @J2ktIncompatible // b/285319375
  public void testLexicographicalComparator() {
    List<byte[]> ordered =