This behaviour has been under discussion as something just may well change. There was a discussion between Juerd and hv once where Juerd said something something the current way being the only sane way, really, and then hv countered with something else reasonable (this is all perl6 mind you) and noted that this behaviour is undefined for a reason.

The observed behaviour is an artifact of the implementation - different implementations are allowed to have different behaviours.

In reply to Re^7: Quantum Weirdness and the Increment Operator by diotalevi
in thread Quantum Weirdness and the Increment Operator by barrachois

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