Call a simpler function.

src/cached.cr

@@ -45,7 +45,7 @@ class DODB::CachedDataBase(V) < DODB::Storage(V)
 		return nil
 	end
 	def [](key : Int32) : V
-		@data[key] rescue raise MissingEntry.new(key)
+		@data[key].clone rescue raise MissingEntry.new(key)
 	end
 
 	def []=(index : Int32, value : V)

src/dodb/index.cr

@@ -114,7 +114,7 @@ class DODB::Index(V) < DODB::Indexer(V)
 	end
 
 	def update(index : String, new_value : V)
-		_, key = get_with_key index
+		key = get_key_on_fs index
 
 		@storage[key] = new_value
 	end