go map comparisons problem

go-map-comparisons-problem

type Doc struct {
  Map map[string]string `json:"map"`
}

func main() {
  // source is a JSON document from an external service
  var doc Doc
  json.Unmarshal(source, &doc)
  SomeFunc(doc.Map)
}

func SomeFunc(paramMap map[string]string) {
  compMap := map[string]string{}
  if reflect.DeepEqual(paramMap, compMap) {
    // why does this not execute when expected?
  }
}