title: Store related keys as OID or strings in MongoDB
body: <p>My mongodb setup stores my data mostly de-normalized, I store just enough user data that I would like display with a post. But I still always store the _id of the related user or related post for say a vote. Some of the ids come from ajax calls(end up stored as strings) and others come directly from mongodb server side(get stored in the data type they come from OID), thus right now when I save these I have a mix of related ids as strings or OIDs. My questions is wether I should be converting them all to strings or all to OIDs?</p>