How do you think export does it? By direct symbol table access, accessing things like %:: and %CGI:: and so on!

While Exporter does access the symbol table directly by using typeglobs, it doesn't use any hash ending in ::. This is probably because it exports symbols, not symbol tables.

I searched both Exporter.pm and Exporter::Heavy.pm. The only reference to something ending in :: was:

        Carp::croak("$_[0]Illegal null symbol in \@${1}::EXPORT")
            if $_[0] =~ /^Unable to create sub named "(.*?)::"/;
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in Exporter/Heavy.pm.

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