I believe the reason is that on each the hash constructed anew....

That's due to while, not each. If you used for, I'd find the code confusing (the while/each idiom is common), and you'd need a comment to explain why. It's simpler to use the temporary variable here.

In reply to Re: Iterating over verbatim hash reference by chromatic
in thread Iterating over verbatim hash reference by rovf

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