Eric in the D3 slack was confused by this example because the D3 Charts rewrite broke it. This PR just pins to the old version. Not a great solution, I don't know. Some options:
Override "alphabet" in the current version and conform to its shape. (Feels wrong.)
Point to a different suitable generic D3 example that is unlikely to be rewritten as a component. (But histogram feels right for this data.)
Fork the old histogram to an unlisted published notebook. (Not sure what we gain over version-pinning.)
Eric in the D3 slack was confused by this example because the D3 Charts rewrite broke it. This PR just pins to the old version. Not a great solution, I don't know. Some options: