Should G++ reject initializer list narrowing conversions in -std=C++11 -pedantic mode?

[David Sankel]

Programs that depend on narrowing conversions in initializer lists 
violate 8.5.4 item 3 of ISO/IEC 14882-2012. Currently these programs are 
compiled successfully with warnings with and without a "-pedantic" flag 
in C++ 2011 language mode.

Are there any drawbacks to having "-pedantic" mode reject these programs 
with an error? As it is now, I don't see an easy way for a user to 
determine if these warnings are due to C++ 2011 non-conformance or just 
bad programming practices.

Thanks,

David

Ref: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55783

-- 
David Sankel <david@stellarscience.com>
Stellar Science Ltd Co - Stellar Scientific Software Solutions