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The $b.freeze call mutates the Pair object $b in a way that changes its
The change that the Set class pays attention to is a change in the
Ostensibly, this change in the .WHICH value indicates that the object has
This question of Pair.WHICH interacts with [perl #128948]. I commented
If this is the intended semantic for Pair, then the "Pair|47804663822576"
Thus each Pair object needs a flag to say which kind of identity it has.
However, it doesn't look to me as though the Pair class was really