Returns whether the specified object is present in the fetch result.
Mac Catalyst 13.0+Beta
YES if anObject is present in the fetch result, otherwise NO.
This method determines whether anObject is present in the fetch result by sending an isEqual: message to each of the fetch result’s objects (and passing anObject as the parameter to each isEqual: message).
Returns an array containing the objects in the fetch result at the indexes in the specified index set.
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