in crates/lsp-client/src/msg.rs [408:417]
fn serialize_request_with_null_params() {
let msg = Message::Request(Request {
id: RequestId::from(3),
method: "shutdown".into(),
params: serde_json::Value::Null,
});
let serialized = serde_json::to_string(&msg).unwrap();
assert_eq!("{\"id\":3,\"method\":\"shutdown\"}", serialized);
}