There is no any code that handles "cache" option https://developer.mozilla.org/en-US/docs/Web/API/Request/cache
On IE11 this causes similar request always fetching from cache.
You're right. It's due technical limitations. See explanation here https://github.com/github/fetch/issues/438#issuecomment-261272466
This should be written in bold in README/Caveats section imho.
It's listed in Caveats of the web site.
It should be listed on top of page with big red font and blinking :)
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It should be listed on top of page with big red font and blinking :)