X-Mailocator allows you to work with object names and their nested properties, but only part of the object is ever entered, not the entire dataLayer structure.
This means that you use entries such as page.type, ecommerce.value, or user.segment, but never entire paths such as dataLayer[0].page_type.product.
This format is shorter, clearer, and works reliably regardless of which dataLayer index the object is located in. Mailocator can read both part of the object name and its specific properties. If the same value appears multiple times in the dataLayer, Mailocator will always use the most recent one.