Maintain ordering in flattened SPF record #6
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Order is significant in SPF, and converting the list to a set and back to remove duplicates also has the effect of shuffling the list. We now remove duplicates while preserving the order of the remaining elements.
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Order is significant in SPF, and converting the list to a set and back to remove duplicates also has the effect of shuffling the list.
This is a naive implementation but it has the virtue of being obvious, and for this purpose it's fast enough.