ByteBufferSerializer produces unexpected results with a duplicated ByteBuffer and a position > 0

[nastra]

The below test shows an issue where a duplicated ByteBuffer with a position > 0 is returning unexpected results:

public void testDuplicatedByteBufferWithCustomPosition() throws IOException
{
    final byte[] INPUT_BYTES = new byte[] { 1, 2, 3, 4, 5 };
    String exp = MAPPER.writeValueAsString(new byte[] { 3, 4, 5 });

    ByteBuffer bbuf = ByteBuffer.wrap(INPUT_BYTES);

    bbuf.position(2);
    ByteBuffer duplicated = bbuf.duplicate();

    assertEquals(exp, MAPPER.writeValueAsString(duplicated));
}

Expected :"AwQF"
Actual   :"AQIDBAU="

I tested this on commit 6e5e2b0 with the 2.10 branch.

[nastra]

I also added a potential fix in #2603

[cowtowncoder]

Thank you for reporting this, PR -- I hope to review this ASAP.