potential for numpy mismatch with restarts

[PhilipDeegan]

serialized simulation can contain objects that may not exist across numpy versions

possible solution:

do not serialize any numpy objects, but cast to list/etc on serialization, and back to numpy on deserialization

[PhilipDeegan]

especially now, with the release of numpy v2

https://stackoverflow.com/questions/78757205/modulenotfounderror-no-module-named-numpy-core