According to https://docs.mongodb.com/manual/reference/bson-type-comparison-order/#objects objects are compared field-by-field (in order that they're stored):
1. by field key name
2. by field value

I ran into some issues with some queries and after some research, I have some interesting results from bsonWoCompare:

> bsonWoCompare({foo: 0}, {bar: 1})
1
> bsonWoCompare({foo: 0}, {bar: "BAR"})
-5
> bsonWoCompare({foo: true}, {bar: "BAR"})
25
> bsonWoCompare({foo: ""}, {bar: "BAR"})
1
> bsonWoCompare({foo: MinKey()}, {bar: "BAR"})
-16
> bsonWoCompare({foo: MaxKey()}, {bar: "BAR"})
112

Since "foo" > "bar", shouldn't bsonWoCompare always return a positive result, regardless of field values?