code: function OrdinaryHasOwnMetadata(MetadataKey, O, P) {
              var metadataMap = GetOrCreateMetadataMap(O, P, /*Create*/ false);
              if (IsUndefined(metadataMap))
                  return false;
              return ToBoolean(metadataMap.has(MetadataKey));
          }
docs: 3.1.2.1 OrdinaryHasOwnMetadata(MetadataKey, O, P) https://rbuckton.github.io/reflect-metadata/#ordinaryhasownmetadata