parkour.util.map-combine documentation

map-combine
(map-combine mapf combinef coll)(map-combine pool mapf combinef coll)
Apply `mapf` to each element of `coll`, then combine those results with
`combinef`.  The `combinef` function must return its identity element when
called with no arguments.  Each step may occur in parallel and the map results
may be combined in any order.
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