Declare tentative return types for ext/standard (#7065)

Fix #72941: Modifying bucket->data by-ref has no effect any longer

To match the PHP 5 behavior, we have to explicitly cater to `buffer` or
`data` being references.

Closes GH-609

Fix #72941: Modifying bucket->data by-ref has no effect any longer

To match the PHP 5 behavior, we have to explicitly cater to `buffer` or
`data` being references.

Closes GH-6096.

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