URLSearchParams passed to Request does not set the correct body and headers

[romainmenke]

This is essentially the same issue as : #674

A similar wrapper for Request might resolve this.
Request being a constructor whereas fetch is just a function might complicate things :/

see : mrhenry/web-tests#171

(maybe this should not be fixed here, that is also fine!)

[zloirock]

Thanks for the report. Could you add a PR?

[romainmenke]

I have some time this weekend and will give it a shot!
Thank you for the quick response :)

[romainmenke]

Still not sure about patching Request in core-js.
Having some non-ecma features in core-js complicates things and don't really want to expand that surface.

Hoping to resolve this through : JakeChampion/polyfill-library#1077

[zloirock]

It should be solved by patching of Request since it should work with any implementation and bad support of URLSearchParams is not a reason to polyfill fetch / Request.

[romainmenke]

Thank you @zloirock

Seeing the final code I don't think I would have gotten there smoothly :)
You are also right that this should be fixed for any fetch implementation.

[romainmenke]

Thank you fo the quick release.
First test results indicate that this is now working for a lot more browsers!