=head3 Large file support.

Since Perl 5.6.0, Perl has supported large files (files larger than
2 gigabytes), and in many common platforms like Linux or Solaris this
support is on by default.

This is both good and bad. It is good in that you can use large files,
seek(), stat(), and -s them.  It is bad in that if you are interfacing Perl
using some extension, the components you are connecting to must also
be large file aware: if Perl thinks files can be large but the other
parts of the software puzzle do not understand the concept, bad things
will happen.  One popular extension suffering from this ailment is the
Apache extension mod_perl.

There's also one known limitation with the current large files   
implementation: unless you also have 64-bit integers (see the next  
section), you cannot use the printf/sprintf non-decimal integer formats
like C<%x> to print filesizes.  You can use C<%d>, though.