box/violin vs bar positioning inconsistency

Not sure we can fix it in the context of the fix for #3402, but logging for reference:

Violin/box auto-populates x-axis categories here:

Plotly.newPlot(
  document.getElementById("gd"),
  {
    data: [{
      type: "violin",
      y: [1]
    },{
      type: "violin",
      y: [1]
    }],
  }
)

But bar does not:

Plotly.newPlot(
  document.getElementById("gd"),
  {
    data: [{
      type: "bar",
      y: [1]
    },{
      type: "bar",
      y: [1]
    }],
  }
)

[nicolaskruchten]

OK, fair enough.

[etpinard]

Ok, but then setting x0 or y0 will solve the issue? How is that different from adding a new box/violin attribute?