Shapes are misplaced when using numbers as categoryarray values

If X axis type is category, and categoryarray contains (string type) numbers, then shapes are horizontally misplaced, as x0 and x1 values in the shape are not considered as items, but as indices of the categoryarray.

Eg.

This one works perfectly:

<div id="tester"></div>
<script>
    var layout = {
      "xaxis": {
        "type": "category",
        "categoryarray": [
          "red", "green", "blue", "purple", "cyan", "yellow", "magenta"
        ],
      },
      "shapes": [
        {
          "type": "rect",
          "xref": "x",
          "yref": "y",
          "x0": "purple",
          "x1": "yellow",
          "y0": 10,
          "y1": 20,
          "fillcolor": "rgba(45,180,135,0.3)",
        }
      ]
    };

    var data = [
      {
        "x": [ "red", "blue", "cyan", "magenta" ],
        "y": [ 10, 20, 30, 40],
      },
    ];
    
    TESTER = document.getElementById('tester');
    Plotly.newPlot( TESTER, data, layout );
</script>

But if I replace the color names to numbers:

  // in "categoryarray":
      "10", "20", "30", "40", "50", "60", "70"
...
  // in "shapes" this won't work:
      "x0": "40",
      "x1": "60",
...
 // in data:
    "x": [ "10", "30", "50", "70" ],

It will work only if I replace the category values to their indices in the shapes:

      "x0": 3,
      "x1": 5,

Note: if this is not intended to be a bug, but an undocumented feature, please document it, so I can rely on it later. 😃

Inizia con la riproduzione JavaScript inline nell’issue e confronta il comportamento dell’asse delle categorie e delle shape per le etichette di colore con quello delle etichette stringa numeriche. Riproduci le shape posizionate in modo errato, quindi verifica che le coordinate delle shape che usano valori di categoria numerici siano allineate alle categorie corrispondenti, anziché soltanto ai relativi indici.