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> grep -l " IV " /usr/share/perl/5.10/pod/*.pod
/usr/share/perl/5.10/pod/perlapi.pod
...
/usr/share/perl/5.10/pod/perliol.pod
/usr/share/perl/5.10/pod/perlreapi.pod
/usr/share/perl/5.10/pod/perlxs.pod

       In fact numbers stored in the native integer format may be stor
+ed
       either in the signed native form, or in the unsigned native for
+m.  Thus
...
       64-bit integers.  Again, this does not mean that Perl can do op
+erations
       only over integers in this range: it is possible to store many 
+more
       integers in floating point format.