Optional
Readonly
deletedTrue if this a placeholder (tombstone) for a deleted item.
If so, #serializedItem will still contain a string representing the deleted item, but the persistent store implementation has the option of not storing it if it can represent the placeholder in a more efficient way.
Optional
Readonly
serializedReturns the data item's serialized representation. This will never be null when storing an item; for a deleted item placeholder, it will contain a special value that can be stored if necessary. When reading an item from a store this could be null. (see #deleted()).
Readonly
versionThe version of the data.
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A versioned item (or placeholder) storable in a [PersistentDataStore].