ds_map_deep_clone

map = ds_map_create();                  //      resulting map D:
map[? "Hello"] = "World";               //      {
map[? "Goodbye"] = "Cruel World";       //          Hello: "World"
                                        //          Goodbye: "Cruel World"
clone = ds_map_create();                //          Clone: 
                                        //          {
ds_map_copy(clone, map);                //              Hello: "World"
                                        //              Goodbye: "Cruel World"
map[? "Clone"] = clone;                 //              Yesterday: "Tomorrow" 
map[? "Zero"] = "Infinity";             //          }
clone[? "Yesterday"] = "Tomorrow";      //          Zero: "Infinity"
                                        //      }
D = ds_map_deep_clone(map);

COPY/// ds_map_deep_clone(map)
//
//  Clones a map deeply to a new copy, 
//  cloning any nested maps and lists,
//  and returning the created root map.
//
//      map         The map to clone
//
/// GMLscripts.com/license
{
    var map, json, clone;
    map = argument0;
    json = json_encode(map);
    clone = json_decode(json);
    return clone;
}