Or $refdataarr holds 13 instead of an array ref.

Either way, it usually happens when one does
$ref = @array;
when one needs to do
$ref = \@array;
or
$ref = [ @array ];

Contrary to what the OP said, it has nothing to do with 5.10. Something else changed too.

In reply to Re^2: "strict" violation on "sort" command with perl 5.10 by ikegami
in thread "strict" violation on "sort" command with perl 5.10 by mstet

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