unordered output of an associated array of associated arrays

[forkit via Digitalmars-d-learn]

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);
        }
    }

}

//--