text: // column composables
  import { validateNumber } from '../utils/Timestamp.js'
  
  export const useColumnProps = {
    columnCount: {
      type: [ Number, String ],
      default: 0,
      validator: validateNumber
    },
    columnIndexStart: {
      type: [ Number, String ],
      default: 0,
      validator: validateNumber
    }
  }
  