Intl Enumeration API Specification is a new ECMA402 Stage 3 proposal which lists supported values of options in pre-existing API.
Interoperability and Compatibility
The API add a new method to pre-exist Intl method to expose available values for some of the option and should improve interoperability between Intl object and help web developer to figure out compatability issues between browers.Gecko
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The return result of the newly added API could be used to call pre-existing ECMA402 API.
Should be straightforward since it is adding a new method to pre-exist Intl object and leverage pre-existing concept and property key and values.
This will help web developer to debug issues since it provide all available values for pre-existing function.