table set width percentage

版本：ant-design-vue 3.2.0 
const  columns  = [{
width: "5%"
}]
警告：[Vue warn]: Invalid prop: type check failed for prop "width". Expected Number with value NaN, got String with value "5%". 
  at <DragHandle prefixCls="ant-table" width="5%" minWidth=undefined  ... > 