For JS folks reading this: variadics are the compiled equivalent to JS' `arguments`. This allows passing in multiple arguments to a function, rather than having to define functions such as join_1(), join_2(), join_3(). Etc. Macros are a workaround, but variadics solve it better
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I'm on the fence with this. I kind of like Rust's explicit take arguments and non overloading of fn https://link.medium.com/EriCqSvn4R They create clearer contracts for readers and in that create a base for better immediate understanding.
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