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C<lutimes()> is identical to C<utimes()> except when the path is
symbolic link, in which case it changes the time stamp of the symlink
link instead of the file it links to.

=head1 PERFORMANCE

You can use t/benchmark.pl to test the perfomance.  Here is the result
on my FreeBSD box.

  Benchmark: timing 100000 iterations of BSD::stat, Core::stat,
  File::stat...
  BSD::stat:  3 wallclock secs ( 2.16 usr +  0.95 sys =  3.11 CPU) @
32160.80/s (n=100000)
  Core::stat:  1 wallclock secs ( 1.18 usr +  0.76 sys =  1.94 CPU) @
51612.90/s (n=100000)
  File::stat:  7 wallclock secs ( 6.40 usr +  0.93 sys =  7.33 CPU) @
13646.06/s (n=100000)

Not too bad, huh?