**Do you want to request a *feature* or report a *bug*?**
Report a bug

**What is the current behavior?**
The `useState` hook's value is shown as `undefined` in React DevTools if the value is a string or a number. Clicking on the bug icon prints the correct values to console.

![image](https://user-images.githubusercontent.com/21111572/65421153-b7225d80-de0b-11e9-8a69-a31836a41c7c.png)


**If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem. Your bug will get fixed much faster if we can run your code and it doesn't have dependencies other than React.**
CodeSandbox: https://codesandbox.io/s/keen-colden-syb7r
Direct link to page so you can see the DevTools: https://2km9v.csb.app/

**What is the expected behavior?**
The DevTools should show the correct value of the hook.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**
React 16.9.0.
Google Chrome [Version 77.0.3865.90 (Official Build) (64-bit)] running on Linux x64.

This issue appeared after version 4.1.0 (9/19/2019) of the DevTools Chrome extension.

Might be same bug as #16843 but this one appears without any complicated reproduction steps.

const inspectPath = useCallback(
    (path: Array<string | number>) => {
      getInspectedElementPath(id, ['hooks', ...path]);
    },
    [getInspectedElementPath, id],
  );
  const handleCopy = useCallback(() => copy(serializeHooksForCopy(hooks)), [
    hooks,
  ]);
  if (hooks === null) {
    return null;
  } else {
    return (
      <div className={styles.HooksTreeView}>
        <div className={styles.HeaderRow}>
          <div className={styles.Header}>hooks</div>
          <Button onClick={handleCopy} title="Copy to clipboard">
            <ButtonIcon type="copy" />
          </Button>
        </div>
        <InnerHooksTreeView
          canEditHooks={canEditHooks}
          hooks={hooks}
          id={id}
          inspectPath={inspectPath}
          path={[]}
        />
      </div>
    );
  }