Question about Perl refs and basic types

[cheekuperl]

I was wondering about the possible return values of the ref function until I came across the list in ref. I also verified that the 11 return values are printed using the following code.

format  =
.
sub fun
{
    print "\nThis is fun";
}
$packRef={};
bless $packRef,"NONSENSE";

$scalarRef=\$_; #1
$arrRef=\@ARGV;  #2
$hashRef=\%ENV;    #3
$codeRef=\&fun;  #4
$refRef=\$scalarRef;  #5
$globRef=\*STDIN; #6
$lvalueRef=\ substr ("learning perl",0,4); #7
$regexpRef= qr/something/;   #8

$formatRef= *STDOUT{FORMAT};#9
$ioRef= *STDOUT{IO};     #10

$vstringRef= \v5.10.10;  #11

print "\n1. scalarref is ". ref($scalarRef);
print "\n2. arrRef is ". ref($arrRef);
print "\n3. hashRef is ". ref($hashRef);
print "\n4. codeRef is ". ref($codeRef);
print "\n5. refRef is ". ref($refRef);
print "\n6. globRef is ". ref($globRef);
print "\n7. lvalueRef is ". ref($lvalueRef);
print "\n8. regexpRef is ". ref($regexpRef);

print "\n9. formatRef is ". ref($formatRef);
print "\n10. ioRef is ". ref($ioRef);

print "\n11. vstringRef is ". ref($vstringRef); #prints SCALAR

print "\n12. packRef is ". ref($packRef);

However, I could not get the vstringRef to print VSTRING. Any clues why #11 above shows SCALAR?

Secondly, I have always come across the statement
Perl has three basic types : scalars, arrays, hashes
However, I have not found a definitive for this in perldocs (I was trying to find a list like there was one for 11 possible return types of ref function).
Could anyone elaborate why the return values of ref can't be called as data types in Perl?