Function encode_frame 

pub fn encode_frame<T: Serialize>(
    value: &T,
    max_frame_bytes: usize,
) -> Result<Vec<u8>, Violation>

Serialise a value into one length-prefixed frame.

Pass a serde_json::value::RawValue when the exact body bytes matter; anything else is encoded by serde.

Errors

Returns a Violation when the value is not JSON-encodable or the encoded body exceeds max_frame_bytes.