Question: In dafny language, we have a map datatype: datatype MapSet = MapSet ( s : map ) How would I go about coding the function

In dafny language, we have a map datatype:
datatype MapSet = MapSet (s : map)
How would I go about coding the function below?
function size (m:MapSet): int
{
/* get the size of the map where we only count the keys with the boolean value "true" */
}

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