template alias = parameter

[Luís.Marques]

Could you please comment on the following behaviors? Are all of 
them intended? Are they internally coherent, with respect to each 
 other?

1)
    void foo(alias f)(int f)
    {
        writeln(f);
    }
    foo(42);

    Error: does not match template

2)
    ...
    foo!(42)(42);

    > 42

3)
    ...
    foo!(7)(42);

    > 42

4)
    void foo(alias f)(int g=f)
    {
        writeln(g);
    }

    foo(42);

    Error: does not match template

5)
    void foo(alias f=42)(int g=f)
    {
        writeln(g);
    }

    foo();

    > 42