Callbacks for results of arithmetic opreations

[znuh]

There should be support for callbacks that can be used to get the result of the operation upon completion.

[g4share]

Definitely right

[cbrandolino]

you mean promises surely

[mausworks]

@cbrandolino callbacks seem to have broke after 2014, I have not seen them since.

[cbrandolino]

@mausworks I don't think they're ES6-compatible actually

[strugee]

I think we should support callbacks because if this library doesn't support all the way down to Internet Explorer 5.5 and Node 0.1.x* it's basically garbage and I can't believe how stubborn and rude the author is

*: not a typo of "0.10.x"