In case anyone sees this and wonders too. I asked in the Laravel GitHub issue tracker and was told that Laravel does not serialize private members and that the Laravel devs consider this a feature.
To me, you might as well randomly translate integer arguments into array arguments and call it a feature.
I don't understand at all why private is a 2nd class citizen with respect to serialization. It is actually a useful OOP construct in its own right, especially to ensure that derived classes don't meddle with things they aren't supposed to meddle with.
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