3265 – .classinfo for Interface-typed reference does not return instance's ClassInfo

If function parameter type is a interface, parameter.classinfo returns inteface's ClassInfo instead of instance's ClassInfo.
interface I {}
class C : I {}
class D : C {}
void o(in Object obj) { writeln(obj.classinfo.name); }
void i(in I obj) { writeln(obj.classinfo.name); }
void c(in C obj) { writeln(obj.classinfo.name); }
void main()
{
	auto d = new D;
	o(d);	// -> D
	i(d);	// -> I, wrong
	c(d);	// -> D
}
I suppose this behavior is a bug.

It is not related to function argument.
This bug occured by interface reference.
Sorry for rough information.
interface I {}
class C : I {}
class D : C {}
void main() {
	auto d = new D;
	C c = d;
	writeln(c.classinfo.name);
	I i = d;
	writeln(i.classinfo.name);
	Object o = d;
	writeln(o.classinfo.name);
}

My friend noted that it is reasonable that interface.classinfo returns interface's classinfo for IUnknown or Interface to C++.
It sound true so that I changed the issue as not important.
I suggest that at least this spec should be documented.
This behavior is very confusing, I suppose it is better to replace classinfo property from interface reference by other appropriate way.

Commit pushed to https://github.com/D-Programming-Language/d-programming-language.org
https://github.com/D-Programming-Language/d-programming-language.org/commit/226de8cfbb07d25c498b5e2b7b794a65437b9ebc
fix Issue 3265 - .classinfo for Interface-typed reference does not return instance's ClassInfo