looking for V[string] workarounds

[Dan]

Can the following be made to build and run, but keep the intent 
of what is shown. I realize it touches on several bugs related to 
const, postblit, and map - but I'm having trouble finding the 
magic combination. The idea is simply have assets store multiple 
series of data in a map indexed by the asset name.

Thanks,
Dan

import std.stdio;
struct Series {
   // REQUIRED - need to have no aliasing
   this(this) { data = data.dup;  }
   private double[] data;
}

struct Assets {
   this(this) { itemToSeries.dup; }
   // REQUIRED - want ctor to dup arg to ensure no aliasing
   this(const(Series[string]) source) {
     itemToSeries = source.dup;
   }
   private Series[string] itemToSeries;
}

void main() {
   auto data = [ "house" : Series([1,2,3.0])];
   auto assets = Assets(data);
   writeln(assets);
}