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Probably for legacy reasons, PDOException::getCode() can return string (it's an
SQLSTATE code). Note that if you instantiate it yourself, you will get
an integer though.
I changed the signature of the Exception stub accordingly, and then
there were errors about incompatible signatures, so I had to change the
signature of Throwable too, which makes sense since a Throwable could be
a PDOException. The signature at
https://www.php.net/manual/en/throwable.getcode.php seems plain wrong,
and that same page of the docs warns about PDOException. Not sure what
are the plans for future versions of PHP.