Good hypothesis. And in fact, when moving away Util.so in all relevant places, I can reproduce the problem with Test::Deep 0.096 — but not with 0.100  (so, the note in the CHANGES file seems to be correct, with respect to the current version no longer insisting on weakref support).

In reply to Re^2: Test::Deep - weak references are not implemented by almut
in thread Test::Deep - weak references are not implemented by andreas1234567

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