Mokku mutates options object passed to fetch function

[lscheibel]

In the minified code in the inject.js somewhere there is this line: t.headers && (t.headers = new Headers(t.headers)) which will modify the options object passed to fetch. Obviously this is pretty bad and will lead to difficult to debug issues but I think this part comes from xhooks, so the problem may lay somewhere in there.

I currently don't have time to dig deeper into this, so I'll leave it here for now.