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doc: \copy can get data values \. and end-of-input confused

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`@@ -1086,6 +1086,10 @@ testdb=>`
`1086`	`1086`	`destination, because all data must pass through the client/server`
`1087`	`1087`	`connection. For large amounts of data the <acronym>SQL</acronym>`
`1088`	`1088`	`command might be preferable.`
	`1089`	`+ Also, because of this pass-through method, <literal>\copy`
	`1090`	`+ ... from</literal> in <acronym>CSV</acronym> mode will erroneously`
	`1091`	`+ treat a <literal>\.</literal> data value alone on a line as an`
	`1092`	`+ end-of-input marker.`
`1089`	`1093`	`</para>`
`1090`	`1094`	`</tip>`
`1091`	`1095`

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`@@ -629,6 +629,7 @@ handleCopyIn(PGconn conn, FILE copystream, bool isbinary, PGresult **res)`
`629`	`629`	`* This code erroneously assumes '\.' on a line alone`
`630`	`630`	`* inside a quoted CSV string terminates the \copy.`
`631`	`631`	`* https://www.postgresql.org/message-id/E1TdNVQ-0001ju-GO@wrigleys.postgresql.org`
	`632`	`+ * https://www.postgresql.org/message-id/bfcd57e4-8f23-4c3e-a5db-2571d09208e2@beta.fastmail.com`
`632`	`633`	`*/`
`633`	`634`	`if (strcmp(buf,"\\.\n")==0\|\|`
`634`	`635`	`strcmp(buf,"\\.\r\n")==0)`

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