> db.foo.drop()
true
> db.foo.ensureIndex({a:1})
{
	"createdCollectionAutomatically" : true,
	"numIndexesBefore" : 1,
	"numIndexesAfter" : 2,
	"ok" : 1
}
> db.foo.explain('executionStats').find({a:1})  // Index bounds correctly reported.
...
				"stage" : "IXSCAN",
				"nReturned" : 0,
				"executionTimeMillisEstimate" : 0,
				"works" : 1,
				"advanced" : 0,
				"needTime" : 0,
				"needYield" : 0,
				"saveState" : 0,
				"restoreState" : 0,
				"isEOF" : 1,
				"invalidates" : 0,
				"keyPattern" : {
					"a" : 1
				},
				"indexName" : "a_1",
				"isMultiKey" : false,
				"isUnique" : false,
				"isSparse" : false,
				"isPartial" : false,
				"indexVersion" : 1,
				"direction" : "forward",
				"indexBounds" : {
					"a" : [
						"[1.0, 1.0]"
					]
				},
...
> db.foo.explain('executionStats').distinct('a') // Index bounds correctly reported.
...
				"stage" : "DISTINCT_SCAN",
				"nReturned" : 0,
				"executionTimeMillisEstimate" : 0,
				"works" : 1,
				"advanced" : 0,
				"needTime" : 0,
				"needYield" : 0,
				"saveState" : 0,
				"restoreState" : 0,
				"isEOF" : 1,
				"invalidates" : 0,
				"keyPattern" : {
					"a" : 1
				},
				"indexName" : "a_1",
				"isMultiKey" : false,
				"isUnique" : false,
				"isSparse" : false,
				"isPartial" : false,
				"indexVersion" : 1,
				"direction" : "forward",
				"indexBounds" : {
					"a" : [
						"[MinKey, MaxKey]"
					]
				},
...
> db.foo.explain('executionStats').count({a:1}) // Index bounds not reported.
...
			"inputStage" : {
				"stage" : "COUNT_SCAN",
				"nReturned" : 0,
				"executionTimeMillisEstimate" : 0,
				"works" : 1,
				"advanced" : 0,
				"needTime" : 0,
				"needYield" : 0,
				"saveState" : 0,
				"restoreState" : 0,
				"isEOF" : 1,
				"invalidates" : 0,
				"keysExamined" : 1,
				"keyPattern" : {
					"a" : 1
				},
				"indexName" : "a_1",
				"isMultiKey" : false,
				"isUnique" : false,
				"isSparse" : false,
				"isPartial" : false,
				"indexVersion" : 1
			}
...