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Aside from being more forgiving, this prevents a rather surprising misbehavior when the "wrong" order was used: the old code didn't throw a syntax error, but absorbed the INTO clause into the last USING expression, which then did strange things downstream. Intentionally not changing the documentation; we'll continue to advertise only the "standard" clause order. Backpatch to 8.4, where the USING clause was added to EXECUTE.