CSHARP-4494: Consider marking serializers sealed (#1448)

* Sealed serializers

* Rebase

* Removed more tests

* Rebase again

* Correction according to PR

* Small correction

Author: papafe

src/MongoDB.Bson/Serialization/Serializers/ArraySerializer.cs

@@ -21,7 +21,7 @@ namespace MongoDB.Bson.Serialization.Serializers
     /// Represents a serializer for one-dimensional arrays.
     /// </summary>
     /// <typeparam name="TItem">The type of the elements.</typeparam>
-    public class ArraySerializer<TItem> :
+    public sealed class ArraySerializer<TItem> :
         EnumerableSerializerBase<TItem[], TItem>,
         IBsonArraySerializer,
         IChildSerializerConfigurable

src/MongoDB.Bson/Serialization/Serializers/BitArraySerializer.cs

@@ -23,7 +23,7 @@ namespace MongoDB.Bson.Serialization.Serializers
     /// <summary>
     /// Represents a serializer for BitArrays.
     /// </summary>
-    public class BitArraySerializer : SealedClassSerializerBase<BitArray>, IRepresentationConfigurable<BitArraySerializer>
+    public sealed class BitArraySerializer : SealedClassSerializerBase<BitArray>, IRepresentationConfigurable<BitArraySerializer>
     {
         // private constants
         private static class Flags

src/MongoDB.Bson/Serialization/Serializers/BooleanSerializer.cs

@@ -21,7 +21,7 @@ namespace MongoDB.Bson.Serialization.Serializers
     /// <summary>
     /// Represents a serializer for Booleans.
     /// </summary>
-    public class BooleanSerializer : StructSerializerBase<bool>, IRepresentationConfigurable<BooleanSerializer>
+    public sealed class BooleanSerializer : StructSerializerBase<bool>, IRepresentationConfigurable<BooleanSerializer>
     {
         #region static
         private static readonly BooleanSerializer __instance = new BooleanSerializer();

src/MongoDB.Bson/Serialization/Serializers/BsonArraySerializer.cs

@@ -18,7 +18,7 @@ namespace MongoDB.Bson.Serialization.Serializers
     /// <summary>
     /// Represents a serializer for BsonArrays.
     /// </summary>
-    public class BsonArraySerializer : BsonValueSerializerBase<BsonArray>, IBsonArraySerializer
+    public sealed class BsonArraySerializer : BsonValueSerializerBase<BsonArray>, IBsonArraySerializer
     {
         // private static fields
         private static BsonArraySerializer __instance = new BsonArraySerializer();

src/MongoDB.Bson/Serialization/Serializers/BsonBinaryDataSerializer.cs

@@ -18,7 +18,7 @@ namespace MongoDB.Bson.Serialization.Serializers
     /// <summary>
     /// Represents a serializer for BsonBinaryDatas.
     /// </summary>
-    public class BsonBinaryDataSerializer : BsonValueSerializerBase<BsonBinaryData>
+    public sealed class BsonBinaryDataSerializer : BsonValueSerializerBase<BsonBinaryData>
     {
         // private static fields
         private static BsonBinaryDataSerializer __instance = new BsonBinaryDataSerializer();

src/MongoDB.Bson/Serialization/Serializers/BsonBooleanSerializer.cs

@@ -18,7 +18,7 @@ namespace MongoDB.Bson.Serialization.Serializers
     /// <summary>
     /// Represents a serializer for BsonBooleans.
     /// </summary>
-    public class BsonBooleanSerializer : BsonValueSerializerBase<BsonBoolean>
+    public sealed class BsonBooleanSerializer : BsonValueSerializerBase<BsonBoolean>
     {
         // private static fields
         private static BsonBooleanSerializer __instance = new BsonBooleanSerializer();

src/MongoDB.Bson/Serialization/Serializers/BsonClassMapSerializer.cs

@@ -26,7 +26,7 @@ namespace MongoDB.Bson.Serialization
     /// Represents a serializer for a class map.
     /// </summary>
     /// <typeparam name="TClass">The type of the class.</typeparam>
-    public class BsonClassMapSerializer<TClass> : SerializerBase<TClass>, IBsonIdProvider, IBsonDocumentSerializer, IBsonPolymorphicSerializer
+    public sealed class BsonClassMapSerializer<TClass> : SerializerBase<TClass>, IBsonIdProvider, IBsonDocumentSerializer, IBsonPolymorphicSerializer
     {
         // private fields
         private readonly BsonClassMap _classMap;

src/MongoDB.Bson/Serialization/Serializers/BsonDateTimeSerializer.cs

@@ -18,7 +18,7 @@ namespace MongoDB.Bson.Serialization.Serializers
     /// <summary>
     /// Represents a serializer for BsonDateTimes.
     /// </summary>
-    public class BsonDateTimeSerializer : BsonValueSerializerBase<BsonDateTime>
+    public sealed class BsonDateTimeSerializer : BsonValueSerializerBase<BsonDateTime>
     {
         // private static fields
         private static BsonDateTimeSerializer __instance = new BsonDateTimeSerializer();

src/MongoDB.Bson/Serialization/Serializers/BsonDecimal128Serializer.cs

@@ -18,7 +18,7 @@ namespace MongoDB.Bson.Serialization.Serializers
     /// <summary>
     /// Represents a serializer for BsonDecimal128s.
     /// </summary>
-    public class BsonDecimal128Serializer : BsonValueSerializerBase<BsonDecimal128>
+    public sealed class BsonDecimal128Serializer : BsonValueSerializerBase<BsonDecimal128>
     {
         // private static fields
         private static BsonDecimal128Serializer __instance = new BsonDecimal128Serializer();

src/MongoDB.Bson/Serialization/Serializers/BsonDocumentSerializer.cs

@@ -22,7 +22,7 @@ namespace MongoDB.Bson.Serialization.Serializers
     /// <summary>
     /// Represents a serializer for BsonDocuments.
     /// </summary>
-    public class BsonDocumentSerializer : BsonValueSerializerBase<BsonDocument>, IBsonDocumentSerializer, IBsonIdProvider
+    public sealed class BsonDocumentSerializer : BsonValueSerializerBase<BsonDocument>, IBsonDocumentSerializer, IBsonIdProvider
     {
         // private static fields
         private static BsonDocumentSerializer __instance = new BsonDocumentSerializer();