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All of the List functions that take a how argument treat it the following way:
`Sequential indicates both sequential evaluation of the deferreds, and sequential combination of the results.
`Parallel indicates parallel evaluation of the deferreds (in the sense that they are all in the scheduler at the same time), and parallel combination of the results. For example, List.iter ~how:`Parallel l ~f will call f on each element of l, creating all of the deferreds, then wait for _all_ of them to finish, then combine any errors (as in Or_error.combine_errors_unit).
`Max_concurrent_jobs n acts like `Parallel in the way it combines the results, but only evaluates n of the deferreds at a time.
val foldi : 'a list->init:'b->f:(int ->'b->'a->'bt)->'bt