message: keep asset url to detect compression
diff: @@ -100,7 +100,7 @@ class AssetManager {
  }
  const data = await ajaxGet({ ...asset, type: 'binary' }).runInContext(ctx);
  - const file = new File([data], 'raw-data');
  + const file = new File([data], asset.url);
  this._assets.set(asset.id, { asset, file, refCount: 1 });
  return Asset.Wrapper(await readFromFile(file, type).runInContext(ctx), asset, this);
  });
  