Returns the {@code SessionStorageEvaluator} that will determine if a {@code Subject}'s state may be persisted in
the Subject's session. The default instance is a {@link DefaultSessionStorageEvaluator}.
@return the {@code SessionStorageEvaluator} that will determine if a {@code Subject}'s state may be persisted in
the Subject's session.
@see DefaultSessionStorageEvaluator
Returns the {@code SessionStorageEvaluator} that will determine if a {@code Subject}'s state may be persisted in the Subject's session. The default instance is a {@link DefaultSessionStorageEvaluator}.
@return the {@code SessionStorageEvaluator} that will determine if a {@code Subject}'s state may be persisted in the Subject's session. @see DefaultSessionStorageEvaluator