Stacked Bar Chart with Rounded Corners

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Vega-Lite JSON Specification

{
  "$schema": "https://vega.github.io/schema/vega-lite/v4.json",
  "data": {"url": "data/seattle-weather.csv"},
  "mark": {"type": "bar", "cornerRadiusTopLeft": 3, "cornerRadiusTopRight": 3},
  "encoding": {
    "x": {"timeUnit": "month", "field": "date", "type": "ordinal"},
    "y": {"aggregate": "count"},
    "color": {"field": "weather"}
  }
}