Is it ok to inherit multiple times same templated interface?

[Alexandru Ermicioi via Digitalmars-d-learn]

Good day,

Given following code example, where a templated interface Wr, and 
an implementation Im is present:
interface Wr(T) {
    T get();
}
class Im(T : ubyte) : Wr!ubyte, Wr!ushort, Wr!string {
    public T t;

    ubyte get() {
        return cast(ubyte) this.t;
    }

    ushort get() {
        return cast(ushort) this.t;
    }

    string get() {
        import std.conv;
        return this.t.to!string ~ " with testings";
    }
}

void main() {
    auto i = new Im!ubyte;
    i.t = 20;

    assert((cast(Wr!ubyte) i).get == 20);
    assert((cast(Wr!ushort) i).get == 20);
    assert((cast(Wr!string) i).get == "20 with testings");
}

Is it ok (not undefined behavior), to have Im implementing 
multiple times interface Wr, with different template arguments?
Or doing so, will eventually lead to subtle bugs?

Currently doing so is allowed, though, it is impossible to call 
implemented methods directly from implementation.
Only by casting i to different implemented interfaces (Wr!ubyte, 
Wr!ushort, and Wr!string), is possible to call each implemented 
get method.

Thanks.