Cldr.Number.Format.Meta.put_format

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

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Specs

put_format(t(), Keyword.t()) :: t()
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put_format(meta, positive_format, negative_format)

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Specs

put_format(t(), Keyword.t(), Keyword.t()) :: t()

Set the metadata format for the positive and negative number format.

Note that this is the parsed format as a simple keyword list, not a binary representation.

Its up to each formatting engine to transform its input into this form. See Cldr.Number.Format.Meta module documentation for the available keywords.