Commit6501a35

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Added information about changing return types that are classes or interfaces

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Original file line number	Diff line number	Diff line change
`@@ -278,6 +278,8 @@ Change return type Yes [2]_ [4]_ No`
`278`	`278`	``ArrayAccess`` array
`279`	`279`	``Traversable`` array
`280`	`280`	``Countable`` array
	`281`	+ class ``<C>`` any subclass of ``<C>``
	`282`	+ interface ``<I>`` any subinterface or implementing class of ``<I>``
`281`	`283`	`=================== ==================================================================`
`282`	`284`
`283`	`285`	`.. [5]When changing the parent class, the original parent class must remain an`

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