hide values in stacked area chart to avoid zero padding to clean up hovertool

When I hover over a stacked line chart, it shows zeroes for all lines not in range. Is there a way to hide these values rather than adding noise to the hover tool?

Plotly.newPlot('test', [{
    line: { shape : 'vh' },
    stackgroup: '1',
    x: [1, 2],
    y: [1, 1],
}, {
    line: { shape : 'vh' },
    stackgroup: '1',
    x: [3, 4],
    y: [2, 2],
}, {
    line: { shape : 'vh' },
    stackgroup: '1',
    x: [3, 4, 5, 6],
    y: [3, 3, 3, 3],
}], {
    hovermode: 'x unified',
    width: '100%',
});

As a jsfiddle and image:

(Cross-post from StackOverflow, which also provides an example use case where this matters)

Start with the JavaScript reproduction using Plotly.newPlot and hovermode "x unified"; confirm how stacked area traces with out-of-range x values appear in the hover tool. Compare the behavior with the linked jsfiddle and use the described zero-value display as the acceptance case. Done means irrelevant zeroes are hidden without obscuring the remaining hover values.