Intent to Implement: "numberingSystem" option for Intl.NumberFormat / "calendar" and "numberingSystem" option for Intl.DateTimeFormat

[Frank Tang]

Contact emails ft...@chromium.org,js...@chromium.org Explainer https://github.com/tc39/ecma402/pull/175 Design docs/spec Specification: https://github.com/tc39/ecma402/pull/175 https://github.com/tc39/ecma402/pull/175 TAG review No need for TAG review since the TC39 / ECMA402 process provide oversight. Summary Allows calendar and numberingSystem to be specified in the options bag of the DateTimeFormat and NumberFormat constructors. Motivation One use case for these options would be, when working with locales which have two numbering systems and calendars in use--the UA default may be the non-Western one, but in some contexts, it may be appropriate to use the Western one. Currently, without the patch, it would be necessary to parse the BCP 47 language tag in the application. This feature make it simpler for the developer. See https://github.com/tc39/ecma402/pull/175 for more details. Risks

Interoperability and Compatibility The PR in https://github.com/tc39/ecma402/pull/175 is in last stage to be merged into ECMA402. Firefox: No public signals Edge: No public signals Safari: No public signals Web developers: No signals Ergonomics Small. Both Intl object already provide the underline format functionality by reading calendar ("ca") and numberingSystem ("nu") from the locale. This feature only add a tiny option reading step Activation Low. A lot of users already use these two API . New Javascript code which follow this change running on an old version of browser which does not support this browser will format the number and/or date in different result. But users should still be able to understand these output. Security None

Debuggability No additional debugging support required. Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)? Yes Is this feature fully tested by web-platform-tests? Yes Tests will be added to test262 before launching Link to entry on the Chrome Platform Status https://www.chromestatus.com/features/5440249461211136

[Mathias Bynens]

LGTM

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