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Process MongoDB query cursor results in parallel with a configurable concurrency limit, without loading all results into memory. Current stable version is 1.1.0 (supports both MongoDB 2 and 3). Released on GitHub, updated as needed (last change added support for cursor `next` method alongside `nextObject`). Unlike async.eachLimit, this package streams results from a cursor rather than requiring an in-memory array. Works with any object that has a `nextObject` method.