[Guy Harris <guy@xxxxxxxxxx>]

> > However, if the rule is
> >
> > accessors throw an exception if *any* of the data they need is
> > missing, for *any* reason
> >
> > then if a dissector tries to fetch stuff from a region that includes the
> > hole, an exception will be thrown - and any dissector that misbehaves if
> > an exception is thrown at any place where it calls an accessor is
> > *already* broken.
> 
> See above.

Umm, the "above" doesn't, in any way, shape, or form, indicate that
throwing an exception is insufficient to make COMPOSITES-with-holes as
safe as any other type of tvbuff.