diff --git a/PersistentMap/KeyStrategies.cs b/PersistentMap/KeyStrategies.cs
index 1a437a8..2efb4ac 100644
--- a/PersistentMap/KeyStrategies.cs
+++ b/PersistentMap/KeyStrategies.cs
@@ -85,6 +85,8 @@ public struct UnicodeStrategy : IKeyStrategy<string>
         // Essential for the < and > operators to work correctly.
         return packed ^ unchecked((long)0x8080808080808080);
     }
+
+    public bool UsesPrefixes => true;
 }
 
 public struct IntStrategy : IKeyStrategy<int>
@@ -101,6 +103,10 @@ public struct IntStrategy : IKeyStrategy<int>
         // though standard int shifting usually works fine for direct mapping.
         return (long)key << 32;
     }
+    
+    public bool UsesPrefixes => true;
+    
+    public bool IsLossless => true;
 }
 
 public struct DoubleStrategy : IKeyStrategy<double>