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I read up some data from shared prefs and jsonDecode it into a variable called shapes. When I inspect the shapes in the debugger it looks like the right type. But when I assign it to the following variable "theShapes" I get errors such as Unhandled Exception: type '_InternalLinkedHashMap<dynamic, dynamic>' is not a subtype of type 'Map<String, List<List<int>>>'

static var theShapes = <String, List<List<int>>>{
'general': [
  [1, 0, 1, 0, 1, 0, 1, 0, 1, 0],
  [0, 1, 0, 1, 0, 1, 0, 1, 0, 1],
  [1, 0, 1, 0, 1, 0, 1, 0, 1, 0],
  [0, 1, 0, 1, 0, 1, 0, 1, 0, 1],
  [1, 0, 1, 0, 1, 0, 1, 0, 1, 0],
  [0, 1, 0, 1, 0, 1, 0, 1, 0, 1],
  [1, 0, 1, 0, 1, 0, 1, 0, 1, 0],
  [0, 1, 0, 1, 0, 1, 0, 1, 0, 1],
  [1, 0, 1, 0, 1, 0, 1, 0, 1, 0],
  [0, 1, 0, 1, 0, 1, 0, 1, 0, 1],
The code used to try to cast the "shapes" variable to the type of "theShapes" is like this at the moment:
 theShapes = shapes
      .map((key, value) => MapEntry(key, List.castFrom(value).toList()));
                Try this: final shapesMap = shapes.map((key, value) => MapEntry(key, List<List<int>>.from(value)));   theShapes = Map<String, List<List<int>>>.from(shapesMap); 
– Mol0ko
                Nov 18, 2020 at 9:20
                Nice try but that code throws this error:  Unhandled Exception: type 'List<dynamic>' is not a subtype of type 'List<int>'  on the first line.
– lost baby
                Nov 18, 2020 at 11:02
  final decodedData = jsonDecode(data);
  if(decodedData is Map){
    return decodedData.map<String,List<List<int>>>((key, value) => MapEntry(key as String, (value as List).map<List<int>>((e) => (e as List).map<int>((i) => i as int).toList()).toList()));
  return null;
        
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