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I'm only including d3-array, scale, color, and interpolate individually, but building them using this method, and only selecting a few functions from each, rollup builds a larger file than the sum of the four files concatenated together. Even building d3-interpolate alone and importing only interpolateLab creates a file exactly as large as d3-interpolate. Upon inspection, it has a lot of code that d3-interpolate alone does not have, such as color name definitions. Is there an option to create a more minimalistic build?