JSON serialization inconsistencies

[0xJohnnyGault]

There seem to be some inconsistencies with Go and Rust with regards to JSON serialization.

AvalancheGo serializes a tx to JSON json.Marshal(tx) that looks like this:

{
  "unsignedTx": {
    "networkID": 1337,
    "blockchainID": "11111111111111111111111111111111LpoYY",
    "outputs": [
      {
        "assetID": "28VTWcsTZ55draGkmjdcS9CFFv4zC3PbvVjkyoqxzNC7Y5msRP",
        "fxID": "spdxUxVJQbX85MGxMHbKw1sHxMnSqJ3QBzDyDYEP3h6TLuxqQ",
        "output": {
          "addresses": ["P-custom18jma8ppw3nhx5r4ap8clazz0dps7rv5u9xde7p"],
          "amount": 19999999899000000,
          "locktime": 0,
          "threshold": 1
        }
      }
    ],
    "inputs": [
      {
        "txID": "CjisYCwF4j7zSyC25MWR21e5xxzJgwdaLEuf7oBXSGpe3oaej",
        "outputIndex": 0,
        "assetID": "28VTWcsTZ55draGkmjdcS9CFFv4zC3PbvVjkyoqxzNC7Y5msRP",
        "fxID": "spdxUxVJQbX85MGxMHbKw1sHxMnSqJ3QBzDyDYEP3h6TLuxqQ",
        "input": { "amount": 19999999900000000, "signatureIndices": [0] }
      }
    ],
    "memo": "0x",
    "validator": {
      "nodeID": "NodeID-JHD1JDUZYkiMdWPMDA9UJhWXR4wf25t39",
      "start": 1711142673,
      "end": 1711142913,
      "weight": 20,
      "subnetID": "CjisYCwF4j7zSyC25MWR21e5xxzJgwdaLEuf7oBXSGpe3oaej"
    },
    "subnetAuthorization": { "signatureIndices": [0] }
  },
  "credentials": [
    {
      "signatures": [
        "0x3265999bb1a3390f09ca28a75e293faeb2f5670d26d9e99dfef9db7ccf08ccbb35f8fe144e63c91f24d0eca57d9db9d8cf7c223362e58b89eb0d317d4c35ac1c00"
      ]
    },
    {
      "signatures": [
        "0x0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000"
      ]
    }
  ],
  "id": "2EhnpHqoBEJYFmfBiBmvoykWLFvxAjMXuuLGjvSCuCWvMaHbo1"
}

Avalanchego generates these bytes for the above: 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

But the only structure I can come up with that this Rust SDK will deserialize looks like this:

{
  "base_tx": {
    "networkID": 1337,
    "blockchainID": "11111111111111111111111111111111LpoYY",
    "outputs": [
      {
        "assetID": "28VTWcsTZ55draGkmjdcS9CFFv4zC3PbvVjkyoqxzNC7Y5msRP",
        "fxID": "spdxUxVJQbX85MGxMHbKw1sHxMnSqJ3QBzDyDYEP3h6TLuxqQ",
        "output": {
          "addresses": ["P-custom18jma8ppw3nhx5r4ap8clazz0dps7rv5u9xde7p"],
          "amount": 19999999899000000,
          "locktime": 0,
          "threshold": 1
        }
      }
    ],
    "inputs": [
      {
        "txID": "2c1CbR7FGYdeFPB4WaeWphHZrChLH7TQ92FRW6U4mCWTnaxVsB",
        "outputIndex": 0,
        "assetID": "28VTWcsTZ55draGkmjdcS9CFFv4zC3PbvVjkyoqxzNC7Y5msRP",
        "fxID": "spdxUxVJQbX85MGxMHbKw1sHxMnSqJ3QBzDyDYEP3h6TLuxqQ",
        "input": {
          "amount": 19999999900000000,
          "signatureIndices": [0]
        }
      }
    ],
    "memo": "0x"
  },
  "validator": {
    "validator": {
      "node_id": "NodeID-111111111111111111116DBWJs",
      "start": 1710879913,
      "end": 1710966313,
      "weight": 20
    },
    "subnet_id": "2c1CbR7FGYdeFPB4WaeWphHZrChLH7TQ92FRW6U4mCWTnaxVsB"
  },
  "subnet_auth": { "sig_indices": [0] },
  "creds": []
}