Why there is too many uneccessary casts?

[Adam D. Ruppe]

On Tuesday, 11 June 2013 at 19:09:11 UTC, Timothee Cour wrote:
> wouldn't it be a better and more consistent idea to implement 
> bearophile's 'Compiler support to implement efficient safe 
> integrals'
> http://d.puremagic.com/issues/show_bug.cgi?id=9850 so uint/int 
> etc would require no cast

This isn't really about overflow though, it is about cutting off 
bits on assignment.

int a = 0;
byte b = a;

test11.d(3): Error: cannot implicitly convert expression (a) of 
type int to byte

The only reason this comes up in the OP's case is because of the 
int promotion for arithmetic.