BOM ambiguity?

[Stephan Stiller]

As an aside to the BOM discussion - something I've always been meaning 
to ask.

So there is a BOM-ambiguity when a file starts with
    FF FE
and then a couple of U+0000 characters, yes? Because this could be 
either UTF-16 or UTF-32 under little-endianness. Has this been pointed 
out and discussed beforehand?

Because the set of BOMs in different encodings don't constitute a 
prefix-free code.

Stephan