Not able to set value 0 for expressions

[steefaan]

If I have a query like:

        $expr = $query->newExpr()->addCase(
            [
                $query->newExpr()->add(['id' => 'test']),
            ],
            [
                0
            ],
            'integer'
        );

the 0 will be changed to 1 in the query itself. The specific example isn't really useful but shows the issue.

[markstory]

Fixed with #7543