This ensures that not only the return values match the expected results, but also that their type is the same.
Going forward, stricter type checking by using `assertSame()` should generally be preferred to `assertEquals()` where appropriate, to make the tests more reliable.
Follow-up to [51079], [51198].
See #52482, #52625, #53397.
git-svn-id: https://develop.svn.wordpress.org/trunk@51225 602fd350-edb4-49c9-b593-d223f7449a82
