Unhandled promises

[kelunik]

https://github.com/cujojs/when/blob/master/docs/api.md#edge-cases

Maybe we want to introduce something similar when assertions are enabled logging warnings.

[bwoebi]

I cannot really imagine how this will work without a ton of false positives…

[kelunik]

@bwoebi We could trigger a warning in case a promise is destructed without a single handler being called. Every promise should at least have a rethrow handler somewhere.

[kelunik]

It will indeed result in a lot of false positives in case of non-consumed bodies in Aerys, etc.