You can't expect to tell the difference between the size of an array (such as '3'), and a plain old number (such as '3').
Again: I can tell the difference between scalar and an array, but just not for constants.
You're still missing the point ... I marked it for you, to make it clearer:
DB<4> sub tst (\[$@]) { print ref $_[0] }
DB<5> $a="a";@a=(1..3)
DB<6> tst $a
SCALAR
DB<7> tst @a
ARRAY
DB<8> tst "a" # <--------- that's the point !
Type of arg 1 to main::tst must be one of [$@] (not constant item) at
+(eval 12)[/usr/share/perl/5.10/perl5db.pl:638] line 2, at EOF
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