The error is from perl itself, not from the CSV parser. It happens deep in the bowels of the code:

sv_setiv (*svp, SvIV (*svp));
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because you specified types, and an empty string is not a number:

$ perl -wE'my $int = 1 + ""'
Argument "" isn't numeric in addition (+) at -e line 1.
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It is (very) easy to alter the code to make IV and NV types forced return of 0 or 0.0 on empty and undef fields, but that would cause backward incompatibilities and I doubt if it warrants a new attribute/options. Besides, you can already guard your own code against this:

$ perl -wE'no warnings "numeric";my $int = 1 + ""'
$
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Or in your own script:

while (my $colref = eval { no warnings "numeric"; $csv->getline_hr ($f
+h)}) {
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Also note that perl does the richt thing anyway:

    say "$_ $names->[$_]\t$colref->{$names->[$_]}" for
    grep { $types->[$_] == Text::CSV_XS::IV } 0 .. $#$types;

->

End of line processing
Argument "" isn't numeric in subroutine entry at /pro/3gl/CPAN/Text-CS
+V_XS/blib/lib/Text/CSV_XS.pm line 871, <$fh> line 3.
New line
status:
error_input:
error_diag:
2 Volume.serialno       3643411828
3 vtype 4
7 skip002       1
8 skip003       0
9 skip004       260
12 skip005      0
13 skip006      2147483648
14 Thumbnail.width      400
15 Thumbnail.height     400
16 skip007      0
17 skip008      0
18 skip009      3
19 skip010      24
20 skip011      0
21 skip012      172
22 skip013      200
23 skip014      518
24 skip015      3603
29 skip017      0
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