Plotting `f64::NAN` drops nearby points and disconnects line

[CramBL]

Describe the bug

Adding NaN values to a PlotPoints disconnects the line plot, and drops nearby points (not sure of the exact behavior of which points are dropped).

I didn't find any description of what the expected behaviour is when you attempt to plot NaN.

To Reproduce
Steps to reproduce the behavior:

1. Clone the minimal example: https://github.com/CramBL/egui-nan-example
2. cargo run

Or create an eframe project and copy this into eframe::update

egui::CentralPanel::default().show(ctx, |ui| {
    let values = [1.0, 2.0, 3.0, f64::NAN, 5.0, 6.0, 7.0, 8.0, 9.0, 10.0];

    let points: PlotPoints = values
        .iter()
        .enumerate()
        .map(|(i, &y)| [i as f64, y])
        .collect();

    Plot::new("line_plot").show(ui, |plot_ui| {
        plot_ui.line(Line::new("series", points));
    });
});

Expected behavior

Not sure, maybe to drop the NaN point and still connect the other lines?

Screenshots