[TIMOB-2614] JSON.stringify failing for droid

With droid on 1.5.1 the stringify function seems to be returning inconsistent results. Everything works as expected with iphone.

var r2 = JSON.stringify( {'0':'asf'} );
Ti.API.error("Rest data: " + r2);
//Rest data: {"0":null}

var r3 = JSON.stringify(['abc','def'] );
Ti.API.error("Rest data: " + r3);
//Rest data: ["abc", "def"]

var o = {'def':'abc'};
var r4 = JSON.stringify( o );
Ti.API.error("Rest data: " + r4);
//Rest data: {def

var user ='me';
var pass = 'mypass';
var enc = 'encoded';

var credentials = {'user_name':user,'password':pass,'encryption' : enc};
var restData = JSON.stringify({'0':credentials,'1':'mobile','2':{'name_value_list':{}}});
Ti.API.error("Rest data: " + restData);
//Rest data: {"2":null,"1":null,"0":null}

var credentials = {'user_name':user,'password':pass,'encryption' : enc};
var tmp = {'0':credentials,'1':'mobile','2':{'name_value_list':{}}};
var restData = JSON.stringify(tmp);
Ti.API.error("Rest data: " + restData);
//Rest data: {"2":null,"1":null,"0":null}