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t = db.index_check7;
t.drop();
for (var i = 0; i < 100; i++)
t.save({x: i});
t.ensureIndex({x: 1});
assert.eq(1, t.find({x: 27}).explain(true).executionStats.totalKeysExamined, "A");
t.ensureIndex({x: -1});
assert.eq(1, t.find({x: 27}).explain(true).executionStats.totalKeysExamined, "B");
assert.eq(40, t.find({x: {$gt: 59}}).explain(true).executionStats.totalKeysExamined, "C");
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