assertEquals("FF", Hexdump.toHexString(data2, 0, 2)); // 2 chars = 1 byte
        assertEquals("FFF", Hexdump.toHexString(data2, 0, 3)); // 3 chars = 1.5 bytes (rounds up to 2)
        assertEquals("FFFE", Hexdump.toHexString(data2, 0, 4)); // 4 chars = 2 bytes
        assertEquals("FFFE80", Hexdump.toHexString(data2, 0, 6)); // 6 chars = 3 bytes
        assertEquals("FFFE807F", Hexdump.toHexString(data2, 0, 8)); // 8 chars = 4 bytes

internal val UNICODE_BOMS =
  Options.of(
    // UTF-8.
    "efbbbf".decodeHex(),
    // UTF-16BE.
    "feff".decodeHex(),
    // UTF-32LE.
    "fffe0000".decodeHex(),
    // UTF-16LE.
    "fffe".decodeHex(),
    // UTF-32BE.
    "0000feff".decodeHex(),
  )

/**
 * Returns an array containing only elements found in this array and also in [other]. The returned
 * elements are in the same order as in this.