Perl SVs vs other VM's boxed types

If nobody noticed  https://rt.perl.org/Ticket/Display.html?id=15667#txn-1310142  since it was called "#15667: exchange value of $a,$b without $temporary variable", I am reposting it as "Perl SV's vs other VM's boxed types", since I probably should have posted it in a new ML thread since it is once of those long research posts I write.
 		 	   		  

• Perl SVs vs other VM's boxed types by bulk 88