When you use the $ne operator it seems to skip the index (unless I am reading the explain wrong) is that intentional?

> db.quotations.find({noteworthy: {"$ne": false}}).limit(25).explain()
{
"cursor" : "BasicCursor",
"indexBounds" : [ ],
"nscanned" : 25,
"nscannedObjects" : 25,
"n" : 25,
"millis" : 0,
"oldPlan" :

{ "cursor" : "BasicCursor", "indexBounds" : [ ] }

,
"allPlans" : [

{ "cursor" : "BasicCursor", "indexBounds" : [ ] }

]
}

versus me changing out {$ne: false} to true (I know it isn't equivalent)

> db.quotations.find(

{noteworthy: true}

).limit(25).explain()
{
"cursor" : "BtreeCursor noteworthy_1",
"indexBounds" : [
[

{ "noteworthy" : true }

,

{ "noteworthy" : true }

]
],
"nscanned" : 5,
"nscannedObjects" : 5,
"n" : 5,
"millis" : 0,
"allPlans" : [
{
"cursor" : "BtreeCursor noteworthy_1",
"indexBounds" : [
[

{ "noteworthy" : true }

,

{ "noteworthy" : true }

]
]
}
]
}