Cldr.Config.requested_locale_names

You're seeing just the function requested_locale_names, go back to Cldr.Config module for more information.
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requested_locale_names(config)

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Specs

requested_locale_names(t()) :: [Cldr.Locale.locale_name()]

Returns a list of all configured locales.

The list contains locales configured both in Gettext and specified in the mix.exs configuration file as well as the default locale.