Also, weaken is working properly on the coderef. You can see this by checking the ref counts using Devel::Peek. The ref count just never reaches 0 because perl itself is holding the last reference.
Weakening a non-closure sub is also not particularly useful. Weakening is meant to be used to prevent memory leaks, but the existence of a non-closure sub can't cause memory leaks. perl has to have a reference to the compiled sub anyway, and without a closure you can't create reference loops.
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