Supporting parameter after variable parameter

[shibukawa]

I am writing node_redis (https://github.com/mranney/node_redis) wrapper. It has method with variable parameter and async callback. JSX doesn't support these native function now.

function bitop(operation : string, destkey : string, ...srckey : string, callback : (Error) -> void) : void;

[shibukawa]

I found work around for my use case, so its priority is low.