DarkMatter.Lists.split_uniq_by

You're seeing just the function split_uniq_by, go back to DarkMatter.Lists module for more information.
Link to this function

split_uniq_by(enumerable, fun)

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Specs

split_uniq_by(Enumerable.t(), (any() -> any())) ::
  {Enumerable.t(), Enumerable.t()}

Split list into uniques by fun