Auto generating multi-method default handler with type casting

[arakov]

When there is only single variant of multi-method, the autogenerated multi-dispatcher should typecast the value to expected types

E.g. in the following code:

public interface Glyph
{
    abstract draw(Window w);
}

The default implementation should be auto.generated, to be equivalent to:

public interface Glyph
{
    abstract draw(Window w);
    
    draw(o)
        <= draw(cast Window(o));
}

[arakov]

When types are known in compile-time it should inject typecasting and call it directly

[arakov]

resolved