The default limit interacts badly with other cursor features, and is no longer needed with progressive 2D near search.
$nearSphere query with 2d index, skip, and limit returns incomplete results
Document that geoNear limit field is deprecated
Remove default limit from $geoNear aggregation stage
$near query with limit > 100 only provides 100 input documents to map/reduce.
limits do not seem to work correctly in shell when count()'ing $near queries