## The current behavior

The full value of the `key` is very difficult / impossible to find and use in the interface of the React Devtools.

![Kapture 2020-04-22 at 11 47 47](https://user-images.githubusercontent.com/1935696/79997715-25222680-84ba-11ea-97ba-51f1679a8c91.gif)

Only managed to find it by accident :(

## The expected behavior

The `key` is visible in the props list to the right.

### Detailed Proposal

As mentioned below in https://github.com/facebook/react/issues/18702#issuecomment-617924196

Add a light divider and new section in the props panel to the right.

Potentially also add a question mark that shows an explanation about the fact that things in this section are not really props.

Ref (Original implementation): https://github.com/facebook/react-devtools/pull/328
// 
  canToggleSuspense: boolean,
  // 
  canViewSource: boolean,
  // 
  hasLegacyContext: boolean,
  // 
  context: Object | null,
  hooks: Object | null,
  props: Object | null,
  state: Object | null,
  // 
  owners: Array<Owner> | null,
  // 
  source: Source | null,
  type: ElementType,
|};
// 
export type DehydratedData = {|
  cleaned: Array<Array<string | number>>,
  data:
    | string
    | Dehydrated
    | Unserializable
    | Array<Dehydrated>
    | Array<Unserializable>
    | {[key: string]: string | Dehydrated | Unserializable, ...},
  unserializable: Array<Array<string | number>>,
|};