Bug report

When an unset is called on a typed array the types seems to get lost or replaced by other types.

Code snippet that reproduces the problem

https://phpstan.org/r/7f6452ee-c77f-49b0-af7f-d5cca60acef3

Expected output

The example should output no errors.

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