Function decode_eval_result 

pub fn decode_eval_result(
    store: impl AsContextMut,
    value: Option<Rooted<AnyRef>>,
    result_ty: Option<WasmType>,
) -> Result<EvalValue>

Decodes nomi-eval’s anyref return value into an EvalValue using the compile-time-known result type. None for the result_ty means the form was empty / definition-only and the host should see EvalValue::Nil. Numeric types (I32, Ratio, Commodity) and StringRef decode directly. PairRef walks the chain, decoding each car per its declared element type. EntityRef returns a placeholder until a downstream consumer needs the structured shape host-side. Takes any AsContextMut so it works with both &mut Store<T> (sync test paths) and &mut Caller<'_, T> (async host fn paths).