don't recurse infinitely in Data::Dumper
Add a configuration variable/option to limit recursion when dumping deep data structures. Defaults the limit to 1000, which can be reduced or increase, or eliminated by setting it to 0. This patch addresses CVE-2014-4330. This bug was found and reported by: LSE Leading Security Experts GmbH employee Markus Vervier. [Patch backported to 5.20 by Dominic Hargreaves for Debian.] Origin: http://perl5.git.perl.org/perl.git/commit/19be3be6968e2337bcdfe480693fff795ecd1304 Patch-Name: fixes/data_dump_infinite_recurse.diff
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