Library Typedefs are fundamentally broken

[Freddy via Digitalmars-d]

On Sunday, 21 September 2014 at 18:24:53 UTC, Freddy wrote:
> Is this supposed to happen?
> ---
> import std.typecons;
>
> alias feet=Typedef!(float,0.0,"feet");
> alias meter=Typedef!(float,0.0,"meter");
>
> void main(){
> 	feet a=4.0;
> 	meter b=5.0;
> 	meter c=a*b;//opps
> 	pragma(msg,typeof(c));
> }
> ---
> $dmd -o- typetest.d
> Typedef!(float, 0.00000F, "meter")

nevermind the build-in typedef is worse
---
typedef float feet;
typedef float meter;
void main(){
	feet a=cast(feet)4.0;//these are required
	meter b=cast(meter)5.0;
	auto c=a*b;//opps
	pragma(msg,typeof(c));
}
---
$dmd type.d -o-
type.d(1): Deprecation: use of typedef is deprecated; use alias
instead
type.d(2): Deprecation: use of typedef is deprecated; use alias
instead
meter