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For multivalued attributes found in the MOF model (my famous labels from EnumerationType instances, e.g.), the returned collection is a plain ArrayList, which is not checking constraints for multiplicity uniqueness etc. The ArrayList is serialized and deserialized; never replaced for an AttrImmutableList or its subclass.
Svata, this is only the case during the boot sequence and it is intentional (see my comment to issue #20849)