Maybe this has changed since 5.10.1, but somehow I doubt it.
You don't appear to fall into the category I mentioned who would not call it an alias. Perl magic uses the magic SV as a buffer between whatever accesses the SV and the magic underneath; the SV will have as many usual fields as necessary for this. As an example, here a shared string has two completely separate string buffers:
perl -wle'use B; use threads; use threads::shared; my $s:shared; $s =
+"123456"; my$t=threads->new(sub{$s}); use Devel::Peek; Dump $s; Dump
+${ bless(\(my$x=is_shared($s)), "B::SV")->object_2svref }; $t->join()
+'
Re: fork, I think you are willfully misunderstanding what Tye meant by mentioning fork, so I don't care to argue.
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