Fields marked as transient in a Serializable class will be ignored during serialization and consequently not written out
to a file (or stream).
This can be useful in situations such as where the content of a field can be recomputed from other fields. To reduce the output size, this field
can be marked as transient and recomputed when a given object is deserialized.
Since transient is very specific to classes that implement Serializable, it is superfluous in classes that do not.
This rule raises an issue when a field is marked as transient, even though the containing class does not implement
Serializable.
