Harden malformed packet handling and split reassembly#59
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What changed
1..8192range on both listener and dialer connections.io.ErrUnexpectedEOFwhenConnectionRequestAcceptedends beforeSystemIndex.Why
Invalid split counts could previously panic or allocate excessive memory on dialer connections. The listener-only limits also rejected valid servers using more than 512 fragments or interleaving more than 16 split packets. Duplicate fragments could overwrite retained data, and a truncated accepted-connection packet could panic during decoding.