structuredAttrs is enabled

trying https://files.pythonhosted.org/packages/e3/99/d6031f4f146298951c46b1bf1cc160c2a63f6e44b3c13a30054add100d5f/altair-6.2.2-py3-none-any.whl
  % Total    % Received % Xferd  Average Speed  Time    Time    Time   Current
                                 Dload  Upload  Total   Spent   Left   Speed

  0      0   0      0   0      0      0      0                              0
 26 778.9k  26 206.3k   0      0 176.4k      0   00:04   00:01   00:03 205.6k
100 778.9k 100 778.9k   0      0 379.8k      0   00:02   00:02         205.6k
100 778.9k 100 778.9k   0      0 379.7k      0   00:02   00:02         205.6k
100 778.9k 100 778.9k   0      0 379.7k      0   00:02   00:02         205.6k