Fix DatePeriod tests for implementing IteratorAggregate #8422
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I wrote them in a wrong way in #8312, so they are rewritten now as @AndrolGenhald advised in #8327.
But actually I'm quite surprised Psalm allows me to call
getIterator()
on a pure Traversable. It actually results in Fatal Error: https://3v4l.org/MEpb3 (But it's the only one way I've found to test it.)Looks like PHP 8 stubs indeed leaks to PHP 7 environment somehow.