my question!

doc1: {"num": [3, 10, 25], "type": "A"}
doc2: {"num": [1, 2, 3, 5], "type": "B"}
doc3: {"num": [5, 6, 7, 1], "type": "A"}

At the moment, i can do that something like:
db.something.find({"type": "A"}, {"num": 1})

I get something like:
"num": [5, 6, 7, 1]
"num": [3, 10, 25]

But I want to get [1, 3, 5, 6, 7, 10, 25]. (Even better if i get only top N like [1, 3, 5] when N=3)

And I don't care about type of return. And, it's much better i can get new documents with cursor like:
new document 1: {1}
new document 2: {3}
new document 3: {5}
.........