String.prototype.localeCompare
Number.prototype.toLocaleString
Date.prototype.toLocaleString
Date.prototype.toLocaleDateString
Date.prototype.toLocaleTimeString
Intl.Collator
Intl.Collator.supportedLocalesOf
Intl.NumberFormat
Intl.NumberFormat.supportedLocalesOf
Intl.DateTimeFormat
Intl.DateTimeFormat.supportedLocalesOf
the function returned by Intl.DateTimeFormat.prototype.format

...are all specified in the ECMAScript Internationalization API Specification 
as taking optional arguments, but not counting them towards the value of their 
length properties.

Norbert


On Oct 12, 2012, at 11:53 , Brendan Eich wrote:

> Yes, so given the case Kevin raises of default-ful followed by default-less I 
> agree with Kevin: length should reflect all but rest (if present).
> 
> Allen, what built-ins would this break, do you know from checking what 
> built-ins break under the current draft's rule?
> 
> /be

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