By default only @...ToMany fields/properties have FetchType.LAZY. All @Basic and @...ToOne mappings are eagerly loaded by default.
Now, merging lazy relationships is a problem if the relationship hasn't been fetched before an instance had beem detached, or if the value is null at the time of merge - as it's not clear if null means not fetched or set explicitly by the client.
Regards,
-marina
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