diff --git a/map.go b/map.go
index 941dcbf..a8d0b59 100644
--- a/map.go
+++ b/map.go
@@ -96,24 +96,8 @@ func (m *Map[K, V]) Values() []V {
 // Do calls f with the underlying primitive map.
 // Be aware that this locks m for write access
 // so Do can be used for reading as well as modifiying m.
-// After f returns, the map will be shallow-copied in order to prevent
-// clueless programmers from storing the map and modifying it afterwards.
-// If you need that little bit of optimization, use DoUnsafe instead
 func (m *Map[K, V]) Do(f func(m map[K]V)) {
 	m.mutex.Lock()
 	defer m.mutex.Unlock()
 	f(m.data)
-
-	nm := map[K]V{}
-	for key, value := range m.data {
-		nm[key] = value
-	}
-	m.data = nm
-}
-
-// DoUnsafe behaves like Do but does not create a shallow-copy of m
-func (m *Map[K, V]) DoUnsafe(f func(m map[K]V)) {
-	m.mutex.Lock()
-	defer m.mutex.Unlock()
-	f(m.data)
 }