Fine tune serde.

tests/serde.rs

@@ -809,10 +809,31 @@ fn test_serde_blob() -> Result<(), Box<EvalAltResult>> {
         ",
     )?;
 
+    let json = serde_json::to_string(&r).unwrap();
+
+    assert_eq!(json, "[0,1,2,3,4,5,6,7,8,9]");
+
     let r = from_dynamic::<serde_bytes::ByteBuf>(&r)?;
 
     assert_eq!(r.to_vec(), vec![0_u8, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
 
+    #[cfg(not(feature = "no_object"))]
+    {
+        let r = engine.eval::<Dynamic>(
+            "
+            let x = blob(10);
+            for i in 0..10 { x[i] = i; }
+            #{ x: x }
+        ",
+        )?;
+
+        let data = format!("{r:?}");
+
+        let encoded = rmp_serde::to_vec(&r).unwrap();
+        let decoded: Dynamic = rmp_serde::from_slice(&encoded).unwrap();
+
+        assert_eq!(format!("{decoded:?}"), data);
+    }
     Ok(())
 }