NULL and null as a property default value are treated differently when overriding a parent property #10987
Description
Bug report
Parent property supports only string. When default value is overriden in child, NULL is correctly reported but null is not.
Code snippet that reproduces the problem
https://phpstan.org/r/b449bcf7-6aba-4362-bb63-7ce1c6d9d0e2
Expected output
Both cases should report an error
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