{
  "data": {"url": "data/cars.json"},
  "mark": "text",
  "encoding": {
    "row": {"field": "Origin", "type": "ordinal"},
    "column": {"field": "Cylinders", "type": "ordinal"},
    "color": {"aggregate": "mean", "field": "Horsepower", "type": "quantitative"},
    "text": {"aggregate": "count", "field": "*", "type": "quantitative"}
  },
  "config": {"mark": {"applyColorToBackground": true}}
}

{
  "data": {"url": "data/cars.json"},
  "mark": "text",
  "encoding": {
    "row": {"field": "Origin", "type": "ordinal"},
    "column": {"field": "Cylinders", "type": "ordinal"},
    "color":  {"aggregate": "count", "field": "*", "type": "quantitative"},
    "text": {"aggregate": "count", "field": "*", "type": "quantitative"}
  },
  "config": {"mark": {"applyColorToBackground": true}}
}

Improve `text_table_heatmap` example to map `color` and `text` to the same field to avoid confusion
Improve `text_table_heatmap` example to map `color` and `text` to the same field to avoid confusion
