Bug report

Parameters passed by ref acquire mixed type. The type should be taken from the method/function signature.

Code snippet that reproduces the problem

https://phpstan.org/r/ddd38952-fe62-4dc4-9d13-ed9aa83ca89c

Expected output

Type = array, error reported for array to string conversion.

This is covered by psalm: https://psalm.dev/r/82e99bda64
Also, there is @param-out annotation that allows to specify the result type.