docs: function getCellContent (field) {
    var entry = this
    var args = Array.prototype.slice.call(arguments, 1)
  
    if (typeof field === 'string') {
      return field
    }
    if (typeof field === 'function') {
      var value
      try {
        value = field.apply(entry, args)
      } catch (e) {
        value = '(err)'
      }
      if (value === undefined || value === null) {
        return ''
      }
  
      return value.toString()
    }
    return ''
  }