It appears that Perl keeps tabs, even on undefs. While the count may be a little off, loading Perl, loading Devel::Peek and compiling your code appears to have created that may undef. :) Surprising isn't it? Try this out: 
use Devel::Peek;
Devel::Peek::Dump(undef);

eval('require File::Find');

Devel::Peek::Dump(undef);

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produces on my system: 
SV = NULL(0x0) at 0x8ca1b0
  REFCNT = 2147483597
  FLAGS = (READONLY)
SV = NULL(0x0) at 0x8ca1b0
  REFCNT = 2147483005
  FLAGS = (READONLY)

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While 
eval('require Devel::Peek');
Devel::Peek::Dump(undef);

eval('require File::Find');

Devel::Peek::Dump(undef);

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produces: 
SV = NULL(0x0) at 0x34a1b0
  REFCNT = 2147483602
  FLAGS = (READONLY)
SV = NULL(0x0) at 0x34a1b0
  REFCNT = 2147483010
  FLAGS = (READONLY)

[download]
On each run, the difference between the two REFCNTs is 592. Although it seems strange that I end up with fewer REFCNTs.

In reply to Re: Dumping undef as a constant produces strange REFCNT by charlesboyo
in thread Dumping undef as a constant produces strange REFCNT by Kc12349

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