Document everything, and turn on errors if we fail to document anything in the future.
diff --git a/csharp/src/Google.Protobuf/CodedInputStream.cs b/csharp/src/Google.Protobuf/CodedInputStream.cs
index f2e1d66..a1abfcb 100644
--- a/csharp/src/Google.Protobuf/CodedInputStream.cs
+++ b/csharp/src/Google.Protobuf/CodedInputStream.cs
@@ -66,7 +66,7 @@
 

         internal const int DefaultRecursionLimit = 64;

         internal const int DefaultSizeLimit = 64 << 20; // 64MB

-        public const int BufferSize = 4096;

+        internal const int BufferSize = 4096;

 

         /// <summary>

         /// The total number of bytes read before the current buffer. The