**What is the current behavior?**

TypeError: Do not know how to serialize a BigInt which makes it so the react dev tools cannot inspect the component props.

Steps to reproduce

1. Set a component prop to some value of type `BigInt`.
2. Open Chrome DevTools, then React Components view, try inspecting the component
3. There will be an exception [here](https://github.com/facebook/react/blob/b438699d3620bff236282b049204e1221b3689e9/packages/react-devtools-extensions/src/contentScript.js#L28-L38) (with the message above)

You can repro this with the following https://codesandbox.io/s/mystifying-cache-jshv3

Note that you need to repo via Chrome DevTools so that the bridge is active, if you use the codesandbox built-in DevTools the behavior is different.

**What is the expected behavior?**

That bigints are handled in a similar way to how symbols are handled. So that they don't crash when they cross a boundary, i.e. postMessage.

**Which versions of React, and which browser / OS are affected by this issue? Did this work in previous versions of React?**

Latest version, hasn't worked before. That I know. Tested in Chrome and Firefox, although the behavior isn't exactly the same in Firefox as in Chrome, it doesn't appear to work in Firefox either.

I would like to propose a fix for this but I cannot find where in the source this would go. I don't care for editing capabilities and such, I just don't want the dev tools to give up on my just because I have BigInts in my code.

| 'data_view'
  | 'date'
  | 'function'
  | 'html_element'
  | 'infinity'
  | 'iterator'
  | 'nan'
  | 'null'
  | 'number'
  | 'object'
  | 'react_element'
  | 'string'
  | 'symbol'
  | 'typed_array'
  | 'undefined'
  | 'unknown';
/**
 * Get a enhanced/artificial type string based on the object instance
 */
function getDataType(data: Object): PropType {
  if (data === null) {
    return 'null';
  } else if (data === undefined) {
    return 'undefined';
  }
  if (isElement(data)) {
    return 'react_element';
  }
  if (typeof HTMLElement !== 'undefined' && data instanceof HTMLElement) {
    return 'html_element';