docs: new_async callback is not optional #682
Merged
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From what I can see, the callback argument is not optional and can't be nil.
See https://github.com/luvit/luv/blob/master/src/async.c#L38.
I can't be 100% sure that the docs are wrong here and not the code itself for not allowing optional callbacks, but I can't see why would anyone need to create an async handle with no callback as that is counterintuitive.