db.jason.find().sort({"rank":1})

{ "_id" : ObjectId("51ae517372779b7eeeb81342"), "name" : "jason" }
{ "_id" : ObjectId("51ae517372779b7eeeb81343"), "name" : "jason" }
{ "_id" : ObjectId("51ae513772779b7eeeb8133a"), "name" : "jason", "rank" : 0 }
{ "_id" : ObjectId("51ae513772779b7eeeb8133b"), "name" : "jason", "rank" : 1 }
{ "_id" : ObjectId("51ae513772779b7eeeb8133c"), "name" : "jason", "rank" : 2 }

I'd like the documents without rank to conclude the sort vs beginning it...but also keep the items with rank in asc order. Is this possible or should I default empty ones with either a string or high number like 99999?

mongodb
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