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Testing convert_to(..., 'ISO-8859-1') fails if there isn't a conversion function available from the database encoding to ISO-8859-1. This has been broken since day one, but the breakage was hidden by pg_do_encoding_conversion's failure to complain, up till commit 49c817eab78c6f0ce8c3bf46766b73d6cf3190b7. Since the data being converted in this test is plain ASCII, no actual conversion need happen (and if it did, it would prove little about citext anyway). So that we still have some code coverage of the convert() family of functions, let's switch to using convert_from, with SQL_ASCII as the specified source encoding. Per buildfarm.