A Golang Map that keeps track of the insert order of items.
The current version can be used as a replacement for map[string]interface{} and allows JSON unmarshalling into it.
No manual adding of items is currently possible.
Unmarshall and marshall JSON:
var m Map
input := `{"423":"abc","231":"dbh","152":"xyz"}`
m.UnmarshalJSON([]byte(input))
output, _ := m.MarshalJSON()
# unlike the standard Golang map, the output will be exact the same and not in random key order