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Google Analytics 4 should ideally be able to read data irrespective of whether dataLayer.unshift() or dataLayer.push() is used, as it is designed to process arrays and objects in the data layer. However, the order in which events are processed could be impacted. Push() adds the data to the end of the dataLayer, whereas unshift() adds the data to the beginning. This could potentially lead to issues if other scripts or tags depend on the order of the data in the dataLayer. Therefore, while it may appear to work initially, it might still lead to unexpected behaviors down the line.
