I remember that unpackVarargs covered part of the splat needs. [https://nim-lang.org/docs/macros.html#unpackVarargs.m%2Cuntyped%2Cvarargs%5Buntyped%5D](https://nim-lang.org/docs/macros.html#unpackVarargs.m%2Cuntyped%2Cvarargs%5Buntyped%5D)
It's in great need of documentation though.
