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=head2 io( OBJ )

...
=head2 sv( OBJ )

Returns a boolean indicating whether OBJ is an instance of the B:: cla
+ss indicated by the method name, and respects any overridden C<-E<gt>
+isa> methods.

for my $nm ( qw( io fm cv hv pvlv gv av bm pvmg pvnv pviv rv nv iv pv 
+sv ) ) {
    my $nm_pkg = "B::$nm";
...
        return blessed( $op ) and $op->isa( $nm_pkg );
    }
}