code: func hasIdenticalPerVersionColumns(versions []apiextensions.CustomResourceDefinitionVersion) bool {
  	if len(versions) == 0 {
  		return false
  	}
  	value := versions[0].AdditionalPrinterColumns
  	for _, v := range versions {
  		if len(v.AdditionalPrinterColumns) == 0 || !apiequality.Semantic.DeepEqual(v.AdditionalPrinterColumns, value) {
  			return false
  		}
  	}
  	return true
  }
docs: // hasIdenticalPerVersionColumns returns true if a CRD sets identical non-nil values
  // to all per-version columns