Feature request

while implementing the first iteration of preg_match array-shape inference, I got a few ideas on how the type inference could be improved.

leaving it here as a feature request, so its not forgotten

https://phpstan.org/r/1e3506dd-78dc-4bbe-9c9e-2a5a2928fcfc

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