mongodb 0.9.1

The official MongoDB driver for Rust (currently in alpha)
Documentation 
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{
  "topology_description": {
    "type": "Unknown",
    "servers": []
  },
  "operation": "read",
  "read_preference": {
    "mode": "SecondaryPreferred",
    "tag_sets": [
      {
        "data_center": "nyc"
      }
    ]
  },
  "suitable_servers": [],
  "in_latency_window": []
}