De-serializes the given byte array by using the {@link #getSerializer() serializer}'s
{@link Serializer#deserialize deserialize} method.
@param serializedIdentity the previously serialized {@code PrincipalCollection} as a byte array
@return the de-serialized (reconstituted) {@code PrincipalCollection}
De-serializes the given byte array by using the {@link #getSerializer() serializer}'s {@link Serializer#deserialize deserialize} method.
@param serializedIdentity the previously serialized {@code PrincipalCollection} as a byte array @return the de-serialized (reconstituted) {@code PrincipalCollection}