Broadcast over splatted tuples

The splatting operator ... is a language feature, while the splat(fun) function is an adaptor exactly for the case that you mentioned. Implementation and docstring:

https://github.com/JuliaLang/julia/blob/76952a88ea650ae8c6b6b1d010ef695ed9c8244d/base/operators.jl#L1150

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