structuredAttrs is enabled

trying https://registry.npmjs.org/leaflet.markercluster/-/leaflet.markercluster-1.5.3.tgz
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed
100  1.17M 100  1.17M   0      0 14.01M      0                              0