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The main reason is for performance. The "unlimited arguments" syntactical sugar is actually an array of Strings. If you are only passing one string, why create an array with only one string? Especially if ~90% of the invocations of this method will be with 3 or fewer arguments, there is no need for the heavier weight array object. It's a little lighter in ...


Syntactic sugar. When manipulating file paths, it is extremely common to have a small number of fixed values. In these cases, it is more convenient to use them directly rather than having to package them into an array.

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