Cldr.Number.Format.Options.validate_options

You're seeing just the function validate_options, go back to Cldr.Number.Format.Options module for more information.
Link to this function

validate_options(number, backend, options)

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Specs

validate_options(Cldr.Math.number_or_decimal(), Cldr.backend(), [
  {atom(), term()}
]) :: {:ok, t()} | {:error, {module(), String.t()}}