Re: get-text-property error if narrowed

[Richard Stallman]

    get-text-property signals an error if the position argument is outside a 
    narrowed region. That is very inconvenient. It would be much better if 
    it behaved like get-char-property which does not do this.

I just tried (get-char-property 1 'face) in my Rmail buffer and got an
error, so I think the two functions are alike in this regard.
I think that an error is the correct result in that case.
(buffer-substring also gives an error when the positions are out of range.)
Why do you think otherwise?

Is there a case in which get-char-property fails to give this error?