Future of D style variadic fuctions

[SiegeLord]

For the ignorant: I do NOT mean variadic templates as used by 
std.stdio.

I note that they are not mentioned in TDPL. What is the deal with 
them and their future? I'll be very displeased if I have to 
recode a good bit of Tango that uses them if they are removed... 
None of my attempts at coding a replacement for them using 
variadic templates have matched their efficiency (in terms of 
generated code size) or ease of use (they invariably require a 
shim function).

-SL