Filexfer version 3 vs. Filexfer version 4

[Dan Davidson <dan.davidson%commatch.com@localhost>]

Hi,

	The version 4 of the SSH File Transfer Protocol strictly forbids the
transmission
of extensions in the SSH_FXP_INIT packet.
However, it may happen that a version 3 Client initiating a connection
towards a version 4 Server
will send such extensions in the INIT message.

What behavior is expected from the Server in such a case ?

Thanks and best regards,
Dan