The current specs for the NumberFormat and DateTimeFormat constructors in the 
ECMAScript internationalization API provide for 3 (NumberFormat) or 2 
(DateTimeFormat) different ways to specify the desired formats: using style 
properties, using skeleton properties, and (for NumberFormat) using patterns. 
Skeletons for NumberFormat are awaiting clarification, and Eric (Microsoft) has 
proposed an alternative for DateTimeFormat skeletons.

I've been thinking about how this can be streamlined, and would like to propose:

1) Remove patterns from NumberFormat. I can imagine a few clients for which 
patterns would be useful, such as spreadsheet-type applications or value-added 
internationalization libraries. However, they require clients to provide 
localized patterns, and the number of applications for which this is both 
necessary and reasonable is fairly small. Most applications are better off 
using styles or skeletons, which let the implementation of the 
internationalization API fully take care of localization. (Patterns would 
actually be more useful for DateTimeFormat, where the limited number of 
supported skeletons will force more clients to roll their own, but there we 
don't offer them.)

2) Drop skeletons from NumberFormat, and instead offer additional properties 
through which clients can taylor the selected format style to their needs. I've 
written up an API proposal that provides the same functionality as skeletons.

3) Merge styles, skeletons, and the Microsoft proposal for DateTimeFormat into 
a unified approach with style values that are skeleton-like, but easier to 
understand, and can be added to in future versions of the API. I've written up 
an API proposal for this as well.

The API proposals are located at:
http://norbertlindenberg.com/ecmascript/internationalization-formats.html

Best regards,
Norbert

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