smoldot can't parse some valid RPC messages

[josepot]

I've created this POC to showcase the issue (run node index.js from the terminal that's at the bottom).

Basically, what happens is that the smoldot chains can't process RPC messages like this one:

'{"jsonrpc":"2.0","id":"extern:\\"health-checker:0\\"","method":"system_health","params":[]}'

Despite the fact that chain.sendJsonRpc doesn't throw, a message gets logged in the console that reads:

Refused malformed JSON-RPC request: data did not match any variant of untagged enum SerdeId

[tomaka]

Caused by serde-rs/json#742

I wasn't aware of this. It's really bad.