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Assume we'd like to change the internal logic of `process_order` - as long as its interface does not change, the updated workers should immediately be able to pick up existing messages in the queue and process them with the updated logic.
Task Versioning
Sometimes, In the event of a task's interface may need to change. Different changing, different versions of the same task can be distinguished using task names. For example, the function name of a fulfillment task might be fulfill_product, but its v0 and v1 implementations could be distinguished by task name: fulfill_product_v0 as opposed to fulfill_product_v1. The application then calls tasks by name using Celery's send_task().
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