Ah, yea, it's fairly inexpensive, and seems to get popped from huts quite easily in my experience. Seemingly before Code of Laws if researching Philosophy...Point well taken on Literature. To be honest, in my most recent game I popped it from a hut so I wasn't in a position to make the decision of whether to continue to focus on building settlers while the AI researched it.
I edited the comment above if you missed it.