How about this: 
use 5.010; # just for "say"
use B;

($f,$g)=(333,"xyz");
say ref B::svref_2object(\$f);
say ref B::svref_2object(\$g);

[download]
edit Devel::Peek might also help you.

In reply to Re: Is an SV and IV or a PV or an NV or a UV? How can I tell? by Yary
in thread Is an SV and IV or a PV or an NV or a UV? How can I tell? by Anonymous Monk

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