Try benchmarking a raw (*os.File).Write vs assigning the file to an io.Writer first.
Just another example of how abstractions don't come for free. 
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#golang performance tip: If your constructor returns an io.Writer (instead of a concrete type), the compiler can't prove that Write(p) calls don't retain p, so p escapes to the heap! (Same goes for other interfaces, obv)
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There are other good reasons for the "accept interfaces, return structs" idiom, but this one is my pet peeve
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