Mismatching type for `pointSymbol` from `ResponsiveLine`

[macabeus]

Describe/explain the bug

The type for the pointSymbol prop from ResponsiveLine<T> is wrong.
Example:

type ChartDatum = {
  x: string;
  y: number;
  stalled: boolean;
};

type ChartSeries = {
  id: string;
  data: readonly ChartDatum[];
};

// ...

return (
  <ResponsiveLine<ChartSeries>
    pointSymbol={({ datum, size, borderWidth }) => {
      // @ts-expect-error
      console.log('Stalled data is at:', datum.stalled); // datum.stalled -> any
      console.log('But the typing thinks it is at:', datum.data?.stalled); // datum.data?.stalled -> boolean

      return (
        <circle
          r={size / 2}
          fill="#0e7490"
          stroke="#22d3ee"
          strokeWidth={borderWidth} />
      );
    }}

To Reproduce

Steps to reproduce the behavior:

1. git clone git@github.com:macabeus/mizuchi.git
2. git checkout a7365f5
3. Check the as never on src/report-generator/ui/components/AttemptsChart.tsx

Expected behavior
No as never should be necessary to type this code