The "unary +" fix is shorter...

$foo->{+__PACKAGE__} = 1;
[download]

Hmm, patching a book isn't quite so easy!

_____________________________________________________
Jeff japhy Pinyan: Perl, regex, and perl hacker.
s++=END;++y(;-P)}y js++=;shajsj<++y(p-q)}?print:??;