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The manual did not mention whether its return value is (first arg - second arg) or (second arg - first arg). The order matters because the return value could have a sign. Fix the manual so that it mentions the function returns (first arg - second arg). Patch reviewed by Tom Lane. Back-patch through v13. Older version's doc format is difficult to add more description. Discussion: https://postgr.es/m/flat/20210206.151125.960423226279810864.t-ishii%40sraoss.co.jp