I think you're right, it doesn't cross the typical mind that one can silently ignore sections of values. Apparently it did cross the mind of at least one implementor, as it was pointed out in the IETF57 LDAPBIS meeting that at least one implementor ignores some octets in certain PDU values.
I believe there is text in X.680 that specifies that all octets are significant--this clarification would really just be a repetition of that statement. Maybe another way of looking at it is: this is an item called out in a reference document that we need to carry into the referring document because people aren't fully reading or understanding the reference document.
>>> "Ramsay, Ron" <Ron.Ramsay@ca.com> 7/17/03 9:48:20 AM >>>
Is there a point to the 'clarification'? Isn't it like saying that all octets of a JPEG file are significant? Sorry, I don't see the point.