given that the hash has not been modified

Specifically, changing the hash by adding or removing a key is what voids the guarantee, and so does assigning to keys. Changing a value does not affect the order.

Adding or removing a key and then undoing the action still counts as a change. That means you can get different orders from two hashes with identical keys.

In reply to Re^2: keys and values order on a hash by ikegami
in thread keys and values order on a hash by citromatik

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