Documentation says of the MapReduce
if not specified, order will be random (done by fetching with md5hash and mod)
However this is not the behavior I witness with 7.6 as the objects seem to be sorted by
id in the batches (for instance batch 1 will contain object from id 00… to 09…, batch 2 from 10… to 19…).
This makes the batches pathological as similar objects are grouped.
Is it possible to enforce a true random ordering with a MapReduce?