5.10.1 had a weak hash ref leak fix, maybe that is relevent somehow. See, https://rt.perl.org/rt3//Public/Bug/Display.html?id=56908.

In reply to Re: Request help for work around for bug in perl 5.10.1 by bulk88
in thread [Solved] Request help for work around for bug in perl 5.10.1 by babel17

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