Vega: Why does axis's tickCount affect tick label format?

[kanitw]

{
  "$schema": "https://vega.github.io/schema/vega-lite/v2.json",
  "data": {"url": "data/seattle-weather.csv"},
  "mark": "tick",
  "encoding": {
    "x": {"field": "precipitation", "type": "quantitative", "axis": {"tickCount": 100}}
  }
}

The ticks now have .0 for all numbers

Is this just artifact of JS floating point calculation?

[domoritz]

I think it's because the ticks actually have values that need the precision. However, their labels are not visible because the labels overlap and so many are removed.

[domoritz]

I still think this is a bug, though.

[jheer]

I disagree that this is a bug. The precision correctly aligns with the number of ticks and currently will stay consistent when changing the pixel length of the axis.