extract with EXTR_SKIP should not override existing types #10436
Description
Bug report
when EXTR_SKIP is passed to extract we should not change types for variables we know exist
inspired by vimeo/psalm#7361
Code snippet that reproduces the problem
https://phpstan.org/r/03a0f64a-8ac5-446e-b502-a899219e5691
Expected output
2x same type dumped
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