No. The intent here is to strip out the Unicode extension subsequence because 
it's always negotiated separately in this library and the fallback of the 
Lookup algorithm doesn't make sense for it. Private use extensions are treated 
as normal parts of the language tag with the normal fallback behavior.

Norbert


On Feb 8, 2012, at 16:36 , Nebojša Ćirić wrote:

> Also, should 8.4.5, 2.a. say /-(u|x)(-([a-z0-9]{2,8}))+/ instead of 
> /-u(-([a-z0-9]{2,8}))+/?
> 
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