Concurrent requests (suspense) with same response data will remain pending and causes an infinite request loop

[stefanbugge]

Bug report

Description / Observed Behavior

Thank you for a great library!

I am rendering a list of components each using swr internally in suspense mode. Each component fetches data with different urls and the response data may result in structurally equal response data (which seems to be the key issue when fetching concurrently).
The initial load will be successful for all requests, but triggering a subsequent request for all components will cause requests resulting in same response data to remain pending and have the caller components remain in a suspended state. Furthermore, an infinite request loop has begun in the background calling the fetcher function every ~2 seconds.

This seems to only be an issue with version 0.5.x. Version 0.4.2 does not exhibit this behavior.

Expected Behavior

To resolve data successfully

Repro Steps / Code Example

https://codesandbox.io/s/swr5-concurrent-suspense-bug-onut5?file=/src/App.tsx

Additional Context

SWR version 0.5.x

[promer94]

Thanks for your detailed repro. It's really helpful !
I think it is related to #907