Don't think so. Could you provide an example?

For "any encoding other than US-ASCII and iso-8859-1" to matter while decoding, you'd need wide characters, in which case Perl will croak with "Wide character in subroutine entry at .../Encode.pm line..." before returning anything. Any non-wide characters will simply be treated as iso-8859-1, because decode('iso-8859-1',...) is telling Perl they are.

In reply to Re^4: question about Encode::decode('iso-8859-1', ...) by Anonymous Monk
in thread question about Encode::decode('iso-8859-1', ...) by perl5ever

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