code: def load_all(kls):
          
          # Force expansion of contents to lists because we invalidate the iterator
          for region_code, loader in list(kls._region_available.items()):
              if loader is not None:  # pragma no cover
                  loader(region_code)
                  kls._region_available[region_code] = None
          for country_code, loader in list(kls._country_code_available.items()):
              if loader is not None:
                  loader(country_code)
                  kls._country_code_available[region_code] = None
docs: Force immediate load of all metadata