Invalid return type for RuntimeException::getCode()

[VincentLanglet]

Bug report

I recently implemented the same dynamic return type on psalm for exception::getCode() than it was implemented for phpstan

• Exception::getCode(): int|string
• PDOException::getCode(): string
• OtherException::getCode(): int

But it seems like it's wrong as reported in the psalm issue vimeo/psalm#7672

Since PDOException extends RuntimeException, we have the following issue
https://phpstan.org/r/42089d28-dbaa-4b67-ac00-154372ce55a8
vs https://3v4l.org/RBCW0

Also not all PDOException::getCode() return a string
https://3v4l.org/VbUUa

[github-actions]

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