Small corrections

Author: papafe

src/MongoDB.Bson/Serialization/BsonDeserializationContext.cs

@@ -41,7 +41,7 @@ private BsonDeserializationContext(
             _allowDuplicateElementNames = allowDuplicateElementNames;
             _dynamicArraySerializer = dynamicArraySerializer;
             _dynamicDocumentSerializer = dynamicDocumentSerializer;
-            _domain = reader.Settings.SerializationDomain ?? BsonSerializer.DefaultDomain;
+            _domain = reader.Settings?.SerializationDomain ?? BsonSerializer.DefaultDomain;
         }
 
         // public properties

src/MongoDB.Bson/Serialization/BsonSerializationContext.cs

@@ -35,7 +35,7 @@ private BsonSerializationContext(
         {
             _writer = writer;
             _isDynamicType = isDynamicType;
-            _domain = writer.Settings.SerializationDomain ?? BsonSerializer.DefaultDomain;
+            _domain = writer.Settings?.SerializationDomain ?? BsonSerializer.DefaultDomain;
         }
 
         // public properties

src/MongoDB.Driver/MongoCollectionSettings.cs

@@ -180,6 +180,7 @@ public virtual MongoCollectionSettings Clone()
             clone._readPreference = _readPreference.Clone();
             clone._writeConcern = _writeConcern.Clone();
             clone._writeEncoding = _writeEncoding.Clone();
+            clone._serializationDomain = _serializationDomain;  //TODO .clone...?
             return clone;
         }
 

src/MongoDB.Driver/MongoDatabaseSettings.cs

@@ -164,6 +164,7 @@ public MongoDatabaseSettings Clone()
             clone._readPreference = _readPreference.Clone();
             clone._writeConcern = _writeConcern.Clone();
             clone._writeEncoding = _writeEncoding.Clone();
+            clone._serializationDomain = _serializationDomain;
             return clone;
         }
 

tests/MongoDB.Bson.Tests/ObjectModel/BsonDocumentWrapperTests.cs

@@ -310,7 +310,7 @@ public void TestCreateWithNominalTypeAndObject()
             Assert.Same(c, wrapper.Wrapped);
             Assert.Equal(false, wrapper.IsMaterialized);
 
-            wrapper = BsonDocumentWrapper.Create(typeof(C), null);
+            wrapper = BsonDocumentWrapper.Create(typeof(C));
             Assert.Same(BsonSerializer.LookupSerializer(typeof(C)), wrapper.Serializer);
             Assert.Same(null, wrapper.Wrapped);
             Assert.Equal(false, wrapper.IsMaterialized);