This change [bd79d7447739](https://entityframework.codeplex.com/SourceControl/changeset/bd79d74477393c20d050837419a0d5731de2fa12) introduced a regression. changed the implementation of DbDatabaseMapping.EntityContainerMappings from a simple IList<StorageEntityContainerMapping> to a ReadOnlyCollection<StorageEntityContainerMapping. This should be reverted.
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