A record array is an array that contains records of a certain type (or modelName).
The record array materializes records as needed when they are retrieved for the first
time. You should not create record arrays yourself. Instead, an instance of
RecordArray or its subclasses will be returned by your application's store
in response to queries.
This class should not be imported and instantiated by consuming applications.
The flag to signal a
RecordArray is currently loading data.
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let people = store.peekAll('person'); people.isUpdating; // false people.update(); people.isUpdating; // true