It's more strict in the proposed rfc. In particular in java the error is allowed to propagate in the program, while here it won't be. In other words if ` $foo->aaa` is uninitialized, you are not allowed to do ` $baz->bbb = $foo->aaa`. In java that's allowed, so in java null pointer deref can really happen anywhere without knowing its origin, and that's really a big problem.
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