Line graph with binary data [Graph2D]

[Beregit]

I'm looking to create a line graph like the following one but I think that Graph2D does not allow it.

I've done the following chart by inserting points with the opposite value 1 second before the real one and using interpolation: false option but this is cheating.

      {
        content: "item 0.0",
        x: new Date("2013-04-20 00:00:00"),
        y: 0,
        group: 1,
      },
      {
        content: "item 1.0",
        x: new Date("2013-04-20 10:00:00"),
        y: 0,
        group: 1,
      },
      {
        content: "item 1.1",
        x: new Date("2013-04-20 10:00:01"),
        y: 1,
        group: 1,
      },
      {
        content: "item 2.1",
        x: new Date("2013-04-20 15:00:00"),
        y: 1,
        group: 1,
      },
      {
        content: "item 2.0",
        x: new Date("2013-04-20 15:00:01"),
        y: 0,
        group: 1,
      },
      {
        content: "item 3.0",
        x: new Date("2013-04-20 20:00:00"),
        y: 0,
        group: 1,
      },
    ]