docs: def diff(self):
          """Determines if changes are needed for the Vault backend"""
  
          if not self.present:
              if self.existing:
                  return DEL
  
              return NOOP
  
          is_diff = NOOP
          if self.present and self.existing:
              a_obj = self.config.copy()
              if self.config and diff_dict(a_obj, self.existing, True):
                  is_diff = CHANGED
  
              if self.description != self.existing.get('description'):
                  is_diff = CONFLICT
  
          elif self.present and not self.existing:
              is_diff = ADD
  
          return is_diff