message: Make _abstractConstraint protected so the original can be persisted.
diff: @@ -81,8 +81,8 @@ export default class RelationshipClass extends ECClass {
  /**
  * A Typescript class representation of a ECRelationshipConstraint.
  */
  -export class RelationshipConstraint implements RelationshipConstraint {
  - private _abstractConstraint?: LazyLoadedRelationshipConstraintClass;
  +export class RelationshipConstraint {
  + protected _abstractConstraint?: LazyLoadedRelationshipConstraintClass;
  public relationshipClass: RelationshipClass;
  public relationshipEnd: RelationshipEnd;
  public multiplicity?: RelationshipMultiplicity;
  