B4J Question Converting Map with number as key to JSON

    Dim key As Int = 7
    Dim m As Map = CreateMap(key: Array As Int(1, 2, 3))
 
    Dim jsonString As String = m.As(JSON).ToString
    Log(jsonString)
 
    'and back...
    Dim m2 As Map = jsonString.As(JSON).ToMap
    Log(m2)
 
    For Each k As Int In m2.Keys     'this loop fails to get the map values
        Dim l As List = m2.Get(k)
        Log(l)
'        For i=0 To l.Size-1            'generates error: java.lang.RuntimeException: Object should first be initialized (List).
'            Dim num As Int = l.Get(i)
'            Log(num)
'        Next
    Next
 
    For Each k2 As String In m2.Keys    'but this loop works 
        Dim l As List = m2.Get(k2)
        For j=0 To l.Size-1
            Dim num As Int = l.Get(j)
            Log(num)
        Next
    Next

{
    "7": [                'note that the JSON conversion has turned 7 into "7"
        1,
        2,
        3
    ]
}
(MyMap) {7=[1, 2, 3]}
(List) Not initialized        'from line 13 - Log(l) in the  For Each k As Int In m2.Keys loop
1                                     'from line 24 - Log(num) in the  For Each k As String In m2.Keys loop
2
3