Rails core - Jun 2013 - Casting gem usage in Rails 4/Ruby 2 vs. Rails 4 push for concern usage/Rails delegation

Just read about the Casting gem:

https://discuss.gemnasium.com/t/casting-adding-behavior-to-objects-without-using-extend/34
https://github.com/saturnflyer/casting

What are the Rails core team''s opinions about using Casting vs. 
ActiveSupport::Concern usage, Rails delegation, etc.?

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On Jun 25, 2013, at 9:54 AM, Gary Weaver wrote:
> Just read about the Casting gem:
> 
>
https://discuss.gemnasium.com/t/casting-adding-behavior-to-objects-without-using-extend/34
> https://github.com/saturnflyer/casting
> 
> What are the Rails core team''s opinions about using Casting vs.
ActiveSupport::Concern usage, Rails delegation, etc.?
Seems to me like AS::Concern and Casting deal with significantly different use
cases: modular functionality at class-load time vs. modular functionality at
runtime.

Also, the benchmark noting the 100x speed difference compared to standard method
dispatch is pretty hair-raising.

--Matt Jones

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