Core vs Library

[Jarrett Billingsley]

"Walter Bright" <newshound1 at digitalmars.com> wrote in message 
news:ftv48m$21m5$1 at digitalmars.com...
> http://reddit.com/info/6foi8/comments/

1: Yes, in .Net languages the core types are aliases to structs in System, 
not the other way around.

2: The article seems self-contradictory.  First you say that an int as a 
struct is slow, possibly ugly, can't be optimized, etc. etc.  But then you 
turn around and say that modern compilers can make a user-defined complex 
type efficient.  Which is it?  It doesn't feel like the article comes to any 
kind of conclusion.  Is it that fundamental types like int and float should 
be builtin, while anything higher-level including complex can be done 
satisfactorily as a library?