Cldr.Number.Format.Meta.put_fraction_grouping

You're seeing just the function put_fraction_grouping, go back to Cldr.Number.Format.Meta module for more information.
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put_fraction_grouping(meta, all)

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Specs

put_fraction_grouping(t(), non_neg_integer()) :: t()
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put_fraction_grouping(meta, first, rest)

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Specs

put_fraction_grouping(t(), non_neg_integer(), non_neg_integer()) :: t()

Sets the number of digits in a group or optionally the first group and subsequent groups for the fractional part of a number.

The grouping character is defined by the locale defined for the current process or supplied as the :locale option to to_string/3.