Show only exact x matches in hover with hovermode="x unified"

Currently, if there are two traces a, b with hovermode="x unified", then a value from trace b can be shown in the hoverinfo even when I am hovering on a x coordinate where there is no point in trace b, but only in trace a, see picture, where hovering over point from trace a with x=3 shows point from trace b with x=3.05.
I would like a way to enforce that only points with exactly matching x coordinates are shown in the hover (something like hovermode="x unified exact"?).

Code to generate figure from the screenshot:

fig = go.Figure(
    layout=go.Layout(hovermode="x unified"),
    data=[
        go.Scatter(
            x=[1, 3],
            y=[1, 1],
            name="a",
        ),
        go.Scatter(
            x=[1, 3.05],
            y=[2, 2],
            name="b",
        ),
    ],
)

Commencez par la reproduction go.Figure fournie et son paramètre de layout hovermode="x unified", puis suivez le comportement de correspondance du hover utilisé par l’implémentation de graphiques. Le travail est terminé lorsqu’une option ou un mode pris en charge n’affiche que les traces dont les coordonnées x correspondent exactement, tout en préservant le comportement de hover unifié existant dans les autres cas.