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The old claim is from my commit d06ebdb8d3425185d7e641d15e45908658a0177d of 2000-07-17, but it seems to have been a plain old thinko; sum(float4) has been distinct from sum(float8) since Berkeley days. Noted by KaiGai Kohei. While at it, mention the existence of sum(money), which is also of embarrassingly ancient vintage.