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This backwards-compatibility hack was introduced twenty years ago (in 8.2), and has surely been of no value for at least the last ten years. However, we shouldn't just leave it sit, because as was just pointed out it creates a dump/reload hazard: if it's set in the receiving environment then array contents will not be restored correctly. Other applications would likely be broken by it too, so whatever residual value it may have seems outweighed by the possibility of misuse. Our precedent for retiring some other comparable parameters, such as standard_conforming_strings, has been to leave the parameter in existence but force it to a fixed value. I judge however that that's not worth the trouble here, because there's no reason to believe that a non-negligible number of applications are either setting or reading this value. Let's just delete it in the master branch and be done with it. Bug: #19747 Reported-by: Ke <kehan5800@gmail.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Laurenz Albe <laurenz.albe@cybertec.at> Discussion: https://postgr.es/m/19747-69b01e7fc190cd58@postgresql.org