Comment #7 on issue 669 by Disabling backward compatibility for some messages only

If you require a 30MB limit for correct operation, with no optional fields, and you retain this data, why can't an attacker send 30MB of valid data and cause you problems that way?

I am really having trouble understanding exactly what you're defending against. Do you have an example of what a hostile message's structure would look like and how disabling optional fields would help?

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