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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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Original file line number	Diff line number	Diff line change
`@@ -162,6 +162,17 @@`
`162`	`162`	`</para>`
`163`	`163`	`</listitem>`
`164`	`164`
	`165`	`+ <listitem>`
	`166`	`+ <para>`
	`167`	`+ Allow <type>json</> and <type>jsonb</> extraction operators to`
	`168`	`+ accept negative subscripts, which count from the end of JSON`
	`169`	`+ arrays. Historically, these operators yielded <literal>NULL</>`
	`170`	`+ in the event of a negative subscript, because negative`
	`171`	`+ subscripts were considered invalid. (Peter Geoghegan, Andrew`
	`172`	`+ Dunstan)`
	`173`	`+ </para>`
	`174`	`+ </listitem>`
	`175`	`+`
`165`	`176`	`</itemizedlist>`
`166`	`177`
`167`	`178`	`</sect2>`

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