unordered output of an associated array of associated arrays

[forkit]

so I'm trying to understand why the output of the code below, is 
in reverse order of the declaration (and how to fix it so that it 
outputs in an ordered way)

i.e. output is:
typeA:
	A2:A2value
	A1:A1value
typeB:
	B3:B3value
	B2:B2value
	B1:B1value

// --

module test;

import std;

void main()
{
     string[string][string] aaTable =
      ([ "typeA" : ["A1" : "A1value", "A2" : "A2value"],
         "typeB" : ["B1" : "B1value", "B2" : "B2value", "B3" : 
"B3value"]
      ]);


     foreach (topLevelKey, topLevelValue; aaTable.byPair)
     {
         writefln("%s:", topLevelKey);

         foreach(key, value; topLevelValue)
         {
             writefln("\t%s:%s", key, value);
         }
     }

}

//--