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Adds a regression test for #11507, reported by @liamduckett. The reproducer from the issue (a
Collection::map()callback that sets$item['foo']on anon-empty-array<string, string>) no longer reports "Function foo() should return Collection<int, non-empty-array<string, string>> but returns Collection<int, non-empty-array<string, string>>" since the bidirectional type narrowing work landed in 2.3.x. The test fails on 2.2.17 with exactly that error and passes on 2.3.x.Closes phpstan/phpstan#11507