do we need broadcast_function?

[JeffBezanson]

I came across this looking for exports to remove. It just does (As...) -> broadcast(f, As...), so I'm not sure we need an exported function for this. Is this widely used?

[StefanKarpinski]

Yeah, that seems pretty unnecessary.

[timholy]

Out of 218 installed packages on my laptop, grep can't find a single use.

[toivoh]

I introduced it with the original broadcast to allow you to get hold of the appropriate broadcasted function directly instead of having to go through a dict lookup each time you wanted to broadcast the same function. But I think it has degenerated since, and now that we have specialization on function arguments I guess it's not needed at all anymore. (Haven't looked into how the current broadcast implementation handles this.)