Convert a T into a boxed RawValue.

Example

// Upstream crate
# #[derive(Serialize)]
pub struct Thing {
    foo: String,
    bar: Option<String>,
    extra_data: Box<RawValue>,
}

// Local crate
use serde::Serialize;
use serde_json::value::{to_raw_value, RawValue};

#[derive(Serialize)]
struct MyExtraData {
    a: u32,
    b: u32,
}

let my_thing = Thing {
    foo: "FooVal".into(),
    bar: None,
    extra_data: to_raw_value(&MyExtraData { a: 1, b: 2 }).unwrap(),
};
# assert_eq!(
#     serde_json::to_value(my_thing).unwrap(),
#     serde_json::json!({
#         "foo": "FooVal",
#         "bar": null,
#         "extra_data": { "a": 1, "b": 2 }
#     })
# );

Errors

This conversion can fail if T's implementation of Serialize decides to fail, or if T contains a map with non-string keys.

use std::collections::BTreeMap;

// The keys in this map are vectors, not strings.
let mut map = BTreeMap::new();
map.insert(vec![32, 64], "x86");

println!("{}", serde_json::value::to_raw_value(&map).unwrap_err());