added a size assertion to the basic example

README.md

@@ -37,6 +37,8 @@ fn main() {
     };
 
     let encoded: Vec<u8> = bincode::encode(&world).unwrap();
+    // 8 bytes for the length of the vector, 4 bytes per float.
+    assert_eq!(encoded.len(), 8 + 4 * 4);
     let decoded: World = bincode::decode(encoded).unwrap();
 
     assert!(world == decoded);

examples/basic.rs

@@ -18,6 +18,8 @@ fn main() {
     };
 
     let encoded: Vec<u8> = bincode::encode(&world).unwrap();
+    // 8 bytes for the length of the vector, 4 bytes per float.
+    assert_eq!(encoded.len(), 8 + 4 * 4);
     let decoded: World = bincode::decode(encoded).unwrap();
 
     assert!(world == decoded);