Serialization framework ignores custom serialization methods of const instances.

[japplegame]

import vibe.d;

struct Data {
    int a;
}

struct Foo {
    private Data m_data;

    this(Data data) { m_data = data; }

    Data toRepresentation() const { return m_data; }
    static Foo fromRepresentation(Data data) { return Foo(data); }
}

void main() {
    const Foo foo1 = Foo(Data(10));
    Foo foo2 = foo1.serializeToJson.deserializeJson!Foo;
    assert(foo1 == foo2);
}

It doesn't work:
Serializing composite type const(Foo) which has no serializable fields