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Supersedes #997, follows up the theory from #997 (comment).
Without the cast all tests from doctrine/common are passing, ORM's test suite is also fine with the change: doctrine/orm#10166.
@Gwemox mind giving this branch a spin in your project?Probably we won't end with this exact solution as it seems ORM has no tests for this behaviour either. The change looks OK ORM-wise, but I'm afraid it may hit users in an unexpected and hard to debug way.