Java.Util.Date fields return 0 instead of null

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Hello, currently using protostream v5 for a project and seeing that Java.Util.Date fields all return "0" instead of null when no value is present. I do see that proto 3 syntax has specified the following default values:

For strings, the default value is the empty string.
For bytes, the default value is empty bytes.
For bools, the default value is false.
For numeric types, the default value is zero.
For enums, the default value is the first defined enum value, which must be 0.

Is this the expected behavior with a date field? When unmarshalling it returns a value of new Date("0") which returns the following date: 1969-12-31-19:00:00

Would greatly appreciate your feedback, thank you.

No source files or tests are named. Start by reproducing unmarshalling an absent Java.Util.Date field with ProtoStream v5, then inspect the date-field serialization and default-value handling; done requires determining and implementing the expected absent-value behavior, with a regression test for the observed result.

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