Hi RutgerVos: I assume you posted the code shown above.
When you write and show us code that demonstrates some painful consequence and then ask "How can I avoid this pain?", the obvious, simple and complete answer is "Don't do that!"
I suppose what you really mean is that other people, users of your code, are indulging nasty, unclean practices that are the source of the pain, such as exemplified by tobyink here. In this case, the only true solution is code review: go around and whack everyone's hand with a ruler until they stop doing the nasty. If a ruler doesn't work, use a hatchet. Others have pointed out tools to aid the review process, but you must ultimately persuade others not to do Bad Things with your code. Other than Good Practice, I'm not aware of any procedure in Perl that will 'armor' a reference, object or otherwise, against being circularized or otherwise given an infinite lifetime.
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