If you want to be really sure you should use refaddr from Scalar::Util since the reference type could overload any of eq, ==, "" or 0+.

Obviously not necessary in this case, but not doing it can catch you out (well, it's caught me out before) if you add overloading at a later date.

In reply to Re^3: Comparing references to sub's by adrianh
in thread Comparing references to sub's by leriksen

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