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[Karl Berry]

    I think (even though only 1 or 2 are valid now) we should allow any
    integer here

Well, maybe any whole number >= 1. I don't think we need to accept 
0 or negative. Surely (?) even standards committees won't be that stupid.

    A macro layer 

Validators/readers will also surely complain.

    I'm not sure that it should be an error in the engine code.

I tend to agree.

Thanks for working on this. (And what an endless amount of trouble it
will cause, but as usual we are powerless.) -k