Integer conversions too pedantic in 64-bit

[Walter Bright]

foobar wrote:
> 1.  that size_t is inconsistent with D's style guide. the "_t" suffix is a C++ convention and not a D one. While it makes sense for [former?] C++ programmers it will confuse newcomers to D from other languages that would expect the language to follow its own style guide. 

It's a C convention.

> 2. the proposed change is backwards compatible - the OP asked for an *additional* alias.

I do not believe that value is added by adding more and more aliases for the 
same thing. It makes the library large and complex but with no depth.