setBlur(blur) {
    const previousValue = this.get(Property.BLUR);
    this.set(Property.BLUR, blur);
    // if the value stays numerical, simply refresh the layer
    if (typeof blur === 'number' && typeof previousValue === 'number') {
      this.changed();
      return;
    }
    this.clearRenderer();
  }
Set the blur size in pixels.
@param {import("../style/flat.js").NumberExpression} blur Blur size in pixels (supports expressions).
@api
@observable