Cldr.Number.Format.Meta.put_fraction_digits

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

put_fraction_digits(meta, min, max \\ 0)

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Specs

put_fraction_digits(t(), non_neg_integer(), non_neg_integer()) :: t()

Set the minimum, and optionally maximum, fractional digits to format.