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(function() {
"use strict";
const coll = db.find4;
coll.drop();
assert.writeOK(coll.insert({a: 1123, b: 54332}));
let o = coll.findOne();
assert.eq(1123, o.a, "A");
assert.eq(54332, o.b, "B");
assert(o._id.str, "C");
o = coll.findOne({}, {a: 1});
assert.eq(1123, o.a, "D");
assert(o._id.str, "E");
assert(!o.b, "F");
o = coll.findOne({}, {b: 1});
assert.eq(54332, o.b, "G");
assert(o._id.str, "H");
assert(!o.a, "I");
assert(coll.drop());
assert.writeOK(coll.insert({a: 1, b: 1}));
assert.writeOK(coll.insert({a: 2, b: 2}));
assert.eq("1-1,2-2",
coll.find()
.sort({a: 1})
.map(function(z) {
return z.a + "-" + z.b;
})
.toString());
assert.eq("1-undefined,2-undefined",
coll.find({}, {a: 1})
.sort({a: 1})
.map(function(z) {
return z.a + "-" + z.b;
})
.toString());
}());
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