Missing Default trait on json::Json

[Byron]

I am trying to implement a google bigquery tabledata.insertAll request, which requires me to allow arbitrary json data within the json-encoded data structure. The official docs present it like this:

{
  "kind": "bigquery#tableDataInsertAllRequest",
  "rows": [
    {
      "insertId": string,
      "json": {
        (key): (value)
      }
    }
  ]
}

The enclosing structure is implementing the Default trait (it's a requirement), which fails to auto-implement as json::Json doesn't implement it for some reason. To my mind, it could be implemented like this:

impl Default for Json {
    fn default() -> Json {
        Json::Null
    }
}

Do you think this can be done, or is there a reason to omit this trait ?

Thank you

[dtolnay]

I agree, we have the equivalent in Serde: serde-rs/json#224.

[alexcrichton]

I'm going to close this now that this crate is deprecated in favor of serde. We're discontinuing feature development in rustc-serialize but will still continue to merge bug fixes if they arise.