Weird that aborting an AbortController with custom reason in react native resulted in aborted signal but reason set as undefined. Took a while to find out about this issue. 

Sad, had to use multiple controllers to differentiate what is the reason…

I don’t think so. Since hermes is ES6 compatible and AbortController isn’t part of ES6 but DOM API. It is probably polyfilled, will have to investigate further to find out. Also the implementation is not full because AbortSignal.any() is also missing.