/** * This class id generator produces successive negative numbers for id's. That is, -1, -2, * etc.. * * The advantage of this type of `identifier` is that these are seldom valid server-side * id values (which typically start at 1 and increase from there) but are of the same * data type (integer). This means that these values can typically be deserialized by a * server and then recognized as provisionally generated. */Ext.define('Ext.data.identifier.Negative', { extend: 'Ext.data.identifier.Sequential', alias: 'data.identifier.negative', config: { increment: -1, seed: -1 }});