Treat a normal function as variadic?

[Robin Allen]

Thanks, this is how I had been trying to do it before giving up and 
trying it the hacky way.

By the looks of your code, I almost had it, too, I just assumed that 
this bit would be impossible:

args[i] = params[i].convertTo!(typeof(args[i]));

because args is a tuple and the docs say the "number and contents of 
tuple elements are fixed at compile time". Is that wrong?