_init(nodeOrColumnNumber, styleId) {
        if (_.isObject(nodeOrColumnNumber)) {
            // Parse the existing node.
            this._parseNode(nodeOrColumnNumber);
        } else {
            // This is a new cell.
            this._columnNumber = nodeOrColumnNumber;
            if (!_.isNil(styleId)) this._styleId = styleId;
        }
    }
Initialize the cell node.
@param {{}|number} nodeOrColumnNumber - The existing node or the column number of a new cell.
@param {number} [styleId] - The style ID for the new cell.
@returns {undefined}
@private