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Release note compatibility item

Note that json and jsonb extraction operators no longer consider anegative subscript to be invalid.

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`@@ -141,6 +141,17 @@`
`141`	`141`	`</para>`
`142`	`142`	`</listitem>`
`143`	`143`
	`144`	`+ <listitem>`
	`145`	`+ <para>`
	`146`	`+ Allow <type>json</> and <type>jsonb</> extraction operators to`
	`147`	`+ accept negative subscripts, which count from the end of JSON`
	`148`	`+ arrays. Historically, these operators yielded <literal>NULL</>`
	`149`	`+ in the event of a negative subscript, because negative`
	`150`	`+ subscripts were considered invalid. (Peter Geoghegan, Andrew`
	`151`	`+ Dunstan)`
	`152`	`+ </para>`
	`153`	`+ </listitem>`
	`154`	`+`
`144`	`155`	`</itemizedlist>`
`145`	`156`
`146`	`157`	`</sect2>`

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