Cldr.Number.Format.Meta.put_round_nearest_digits

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

put_round_nearest_digits(meta, digits)

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Specs

put_round_nearest_digits(t(), non_neg_integer()) :: t()

Set the increment to which the number should be rounded.