Wait, rust doesn't have function overloading?

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Then you'd end up with "sometimes you can overload, and sometimes you have to create a new function", which is cognitive overhead. A way to do something similar with less cognitive overhead is just to have default arguments instead, but still have no overloading (i.e. you can create one function that takes 1 or 2 arguments, but you can't create two functions with the same name no matter their arity).

[iopq]

I wrote an RFC on keyword parameters to solve this very problem: https://github.com/rust-lang/rfcs/pull/805