This is not important but it seems that this if statement is superfluous since `typeof` always returns a string. 

https://github.com/facebook/react/blob/553440bd1578ef71982c4a10e2cc8c462f33d9be/packages/react-devtools-shared/src/hydration.js#L246

configurable: true,
      enumerable: false,
      value: source.size,
    },
    [meta.readonly]: {
      configurable: true,
      enumerable: false,
      value: !!source.readonly,
    },
    [meta.type]: {
      configurable: true,
      enumerable: false,
      value: source.type,
    },
    [meta.unserializable]: {
      configurable: true,
      enumerable: false,
      value: !!source.unserializable,
    },
  });
  delete destination.inspected;
  delete destination.name;
  delete destination.preview_long;
  delete destination.preview_short;
  delete destination.size;
  delete destination.readonly;
  delete destination.type;
  delete destination.unserializable;
}