Do not rewind position
when serializing direct ByteBuffer
#4164
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ByteBufferSerializer considers the position when serializing heap buffers, but ignores it (by rewinding) for direct buffers. I believe the former behavior is correct, so I've aligned the direct buffer code with that.
This might be better for 2.17, I don't know.
testByteBuffer
was broken by this change because it didn't flip the buffer after writing.