On Dec 4, 1:25    
wrote:
> Yukihiro Matsumoto wrote:
> > I mentioned about fragility just because that will be an issue for
> > Ruby 2.0.      > > core functionality is done by C functions.    
> > Rubinius suffers more.        
> > separating/protecting core implementation from user code by some kind
> > of namespaces or packages.
>
> I agree. There's no practical reason anyone should be able to override
> Fixnum#+, after all, and protecting the core simplifies implementation
> and optimization too.

Hey, leave my foot alone! I'll shoot it if I dang well want to!