Specifies how many tasks to run simultaneously, default value is 5.
If true, will continue processing tasks after error occurred.
Handler to process each task.
If provided, can avoid adding duplicate tasks with same keys.
Specifies how many times to retry before one task success.
If one task's retry times execeed, it will never retry automatically,
but you can still retry all failed tasks by calling retry() manually.
Setting this option to values > 0 implies continueOnError is true.
The start task array which will be passed to handler in order.
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Options of queue.