Store replay whole buffer at a time

rust/src/replay.rs

@@ -351,9 +351,7 @@ impl ReplayRecorder {
             let mut buf = Vec::new();
             let cursor = Cursor::new(&mut buf);
             ciborium::into_writer(&self.replay, cursor).ok();
-            for byte in buf {
-                file.store_8(byte);
-            }
+            file.store_buffer(&PackedArray::from_iter(buf));
         }
     }