How about a new props for anchor?

[vianvio]

Currently, I think the reason we can't support hash route is due to these lines

    if (typeof props.to === 'string') {
      hashFragment = props.to
        .split('#')
        .slice(1)
        .join('#');
    } else if (
      typeof props.to === 'object' &&
      typeof props.to.hash === 'string'
    ) {
      hashFragment = props.to.hash.replace('#', '');
    }

If we let the user to set anchor Id, leave a prop such as anchor, and use the string passed in to replace these lines (or leave these lines for default logic also works), then we can support hash routers.

[rafgraph]

Added elementId prop to v2.2.0