Serialize / Deserialize DockState

[osvegn]

In some case, I found that f32 type in structure are serialize into "null" value. But on deserialize, panic occurs cause null is not a valid type for f32. Is there a way to prevent null value to append during serialization ?

"dock_state": {
    "surfaces": [
      {
        "Main": {
          "tree": [
            {
              "Leaf": {
                "rect": {
                  "min": {
                    "x": null,
                    "y": null
                  },
                  "max": {
                    "x": null,
                    "y": null
                  }
                },
                "viewport": {
                  "min": {
                    "x": null,
                    "y": null
                  },
                  "max": {
                    "x": null,
                    "y": null
                  }
                },
                "tabs": [],
                "active": 0,
                "scroll": 0.0
              }
            }
          ],
          "focused_node": null
        }
      }
    ],
  }