On one of the other lists a suggestion was made to use the IS DISTINCT FROM operator. I didn't remember seeing anything about this before so I tried to look it up in the 7.4.2 documentation. After not finding anything, I tried grepping the documentation source and was only able to find a reference to it in the release notes for 7.3. It may be that because of line breaks or mark up that I missed it. But even if it is there, it doesn't seem to be in an obvious place.
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