Invalid output in RPC API docs for /api/v0/dag/import?stats=true

Checklist

• This is a bug report, not a question. Ask questions on discuss.ipfs.io.
• I have searched on the issue tracker for my bug.
• I am running the latest go-ipfs version or have an issue updating.

Installation method

ipfs-update or dist.ipfs.io

Version

go-ipfs version: 0.11.0
Repo version: 11
System version: amd64/linux
Golang version: go1.16.12

Config

{
  "API": {
    "HTTPHeaders": {}
  },
  "Addresses": {
    "API": "/ip4/127.0.0.1/tcp/5001",
    "Announce": [],
    "AppendAnnounce": null,
    "Gateway": "/ip4/127.0.0.1/tcp/8080",
    "NoAnnounce": [],
    "Swarm": [
      "/ip4/0.0.0.0/tcp/4001",
      "/ip6/::/tcp/4001",
      "/ip4/0.0.0.0/udp/4001/quic",
      "/ip6/::/udp/4001/quic"
    ]
  },
  "AutoNAT": {},
  "Bootstrap": [
    "/dnsaddr/bootstrap.libp2p.io/p2p/QmNnooDu7bfjPFoTZYxMNLWUQJyrVwtbZg5gBMjTezGAJN",
    "/dnsaddr/bootstrap.libp2p.io/p2p/QmQCU2EcMqAqQPR2i9bChDtGNJchTbq5TbXJJ16u19uLTa",
    "/dnsaddr/bootstrap.libp2p.io/p2p/QmbLHAnMoJPWSCR5Zhtx6BHJX9KiKNN6tpvbUcqanj75Nb",
    "/dnsaddr/bootstrap.libp2p.io/p2p/QmcZf59bWwK5XFi76CZX8cbJ4BhTzzA3gU1ZjYZcYW3dwt",
    "/ip4/104.131.131.82/tcp/4001/p2p/QmaCpDMGvV2BGHeYERUEnRQAwe3N8SzbUtfsmvsqQLuvuJ",
    "/ip4/104.131.131.82/udp/4001/quic/p2p/QmaCpDMGvV2BGHeYERUEnRQAwe3N8SzbUtfsmvsqQLuvuJ"
  ],
  "DNS": {
    "Resolvers": null
  },
  "Datastore": {
    "BloomFilterSize": 0,
    "GCPeriod": "1h",
    "HashOnRead": false,
    "Spec": {
      "mounts": [
        {
          "child": {
            "path": "blocks",
            "shardFunc": "/repo/flatfs/shard/v1/next-to-last/2",
            "sync": true,
            "type": "flatfs"
          },
          "mountpoint": "/blocks",
          "prefix": "flatfs.datastore",
          "type": "measure"
        },
        {
          "child": {
            "compression": "none",
            "path": "datastore",
            "type": "levelds"
          },
          "mountpoint": "/",
          "prefix": "leveldb.datastore",
          "type": "measure"
        }
      ],
      "type": "mount"
    },
    "StorageGCWatermark": 90,
    "StorageMax": "10GB"
  },
  "Discovery": {
    "MDNS": {
      "Enabled": true,
      "Interval": 10
    }
  },
  "Experimental": {
    "AcceleratedDHTClient": false,
    "FilestoreEnabled": false,
    "GraphsyncEnabled": false,
    "Libp2pStreamMounting": false,
    "P2pHttpProxy": false,
    "StrategicProviding": false,
    "UrlstoreEnabled": false
  },
  "Gateway": {
    "APICommands": [],
    "HTTPHeaders": {
      "Access-Control-Allow-Headers": [
        "X-Requested-With",
        "Range",
        "User-Agent"
      ],
      "Access-Control-Allow-Methods": [
        "GET"
      ],
      "Access-Control-Allow-Origin": [
        "*"
      ]
    },
    "NoDNSLink": false,
    "NoFetch": false,
    "PathPrefixes": [],
    "PublicGateways": null,
    "RootRedirect": "",
    "Writable": false
  },
  "Identity": {
    "PeerID": "12D3KooWGn8esyGN8DB1UCsVTZPWxkr6ELGBP9AffLNQqbrfejv7"
  },
  "Internal": {},
  "Ipns": {
    "RecordLifetime": "",
    "RepublishPeriod": "",
    "ResolveCacheSize": 128
  },
  "Migration": {
    "DownloadSources": null,
    "Keep": ""
  },
  "Mounts": {
    "FuseAllowOther": false,
    "IPFS": "/ipfs",
    "IPNS": "/ipns"
  },
  "Peering": {
    "Peers": [
      {
        "Addrs": [
          "/ip4/3.134.223.177/udp/6746/quic"
        ],
        "ID": "12D3KooWN8vAoGd6eurUSidcpLYguQiGZwt4eVgDvbgaS7kiGTup"
      },
      {
        "Addrs": [
          "/ip4/147.75.49.71/udp/6746/quic",
          "/ip4/147.75.49.71/tcp/6745"
        ],
        "ID": "12D3KooWGBWx9gyUFTVQcKMTenQMSyE2ad9m7c9fpjS4NMjoDien"
      },
      {
        "Addrs": [
          "/ip4/147.75.86.255/udp/6746/quic",
          "/ip4/147.75.86.255/tcp/6745"
        ],
        "ID": "12D3KooWFrnuj5o3tx4fGD2ZVJRyDqTdzGnU3XYXmBbWbc8Hs8Nd"
      },
      {
        "Addrs": [
          "/ip4/212.6.53.9/udp/6746/quic",
          "/ip4/212.6.53.9/tcp/6745"
        ],
        "ID": "12D3KooWNNuTcH39tagS4MyddgQP7jBNSHJn4cVuTKuY4bjNZ6cw"
      }
    ]
  },
  "Pinning": {
    "RemoteServices": {
      "pinata": {
        "API": {
          "Endpoint": "https://api.pinata.cloud/psa"
        },
        "Policies": {
          "MFS": {
            "Enable": false,
            "PinName": "",
            "RepinInterval": ""
          }
        }
      }
    }
  },
  "Plugins": {
    "Plugins": null
  },
  "Provider": {
    "Strategy": ""
  },
  "Pubsub": {
    "DisableSigning": false,
    "Router": ""
  },
  "Reprovider": {
    "Interval": "12h",
    "Strategy": "all"
  },
  "Routing": {
    "Type": "dht"
  },
  "Swarm": {
    "AddrFilters": null,
    "ConnMgr": {
      "GracePeriod": "20s",
      "HighWater": 900,
      "LowWater": 600,
      "Type": "basic"
    },
    "DisableBandwidthMetrics": false,
    "DisableNatPortMap": false,
    "RelayClient": {},
    "RelayService": {},
    "Transports": {
      "Multiplexers": {},
      "Network": {},
      "Security": {}
    }
  }
}

Description

I used curl to import a .car file with the stats flag set to true:

$ curl -X POST -F file=@output.car "http://127.0.0.1:5001/api/v0/dag/import?stats=true"

The docs indicate that I should get back the following response body:

{
  "Root": {
    "Cid": {
      "/": "<cid-string>"
    },
    "PinErrorMsg": "<string>"
  },
  "Stats": {
    "BlockBytesCount": "<uint64>",
    "BlockCount": "<uint64>"
  }
}

Instead I get two sequential JSON documents in the response body:

{
  "Root": {
    "Cid": {
      "/": "bafyreia5oy46mxuw2bplcncfdekg7y4mxcyebnssj7vaxokcauupmqp2i4"
    },
    "PinErrorMsg": ""
  }
}
{
  "Stats": {
    "BlockCount": 1,
    "BlockBytesCount": 15
  }
}