Use Pattern Matching

src/Marten/Events/CodeGeneration/EventDocumentStorageGenerator.cs

@@ -278,7 +278,7 @@ private static GeneratedType buildAppendEventOperation(EventGraph graph, Generat
         var columns = new EventsTable(graph).SelectColumns()
 
             // Hokey, use an explicit model for writeable vs readable columns some day
-            .Where(x => !(x is IsArchivedColumn)).ToList();
+            .Where(x => x is not IsArchivedColumn).ToList();
 
         // Hokey, but we need to move Sequence to the end
         var sequence = columns.OfType<SequenceColumn>().Single();

src/Marten/Internal/CodeGeneration/BulkLoaderBuilder.cs

@@ -71,7 +71,7 @@ public GeneratedType BuildType(GeneratedAssembly assembly)
 
     private static List<UpsertArgument> orderArgumentsForBulkWriting(UpsertFunction upsertFunction)
     {
-        var arguments = upsertFunction.OrderedArguments().Where(x => !(x is CurrentVersionArgument)).ToList();
+        var arguments = upsertFunction.OrderedArguments().Where(x => x is not CurrentVersionArgument).ToList();
         // You need the document body to go last so that any metadata pushed into the document
         // is serialized into the JSON data
         var body = arguments.OfType<DocJsonBodyArgument>().Single();

src/Marten/Internal/CompiledQueries/CompiledQueryPlan.cs

@@ -281,7 +281,7 @@ public ICompiledQuery<TDoc, TOut> CreateQueryTemplate<TDoc, TOut>(ICompiledQuery
     {
         foreach (var parameter in QueryMembers) parameter.StoreValue(query);
 
-        if (!(query is IQueryPlanning) && areAllMemberValuesUnique(query))
+        if (query is not IQueryPlanning && areAllMemberValuesUnique(query))
         {
             return query;
         }

src/Marten/Internal/Sessions/OperationPage.cs

@@ -70,7 +70,7 @@ public void ApplyCallbacks(DbDataReader reader,
     {
         var first = _operations.First();
 
-        if (!(first is NoDataReturnedCall))
+        if (first is not NoDataReturnedCall)
         {
             first.Postprocess(reader, exceptions);
             try
@@ -119,7 +119,7 @@ public async Task ApplyCallbacksAsync(DbDataReader reader,
     {
         var first = _operations.First();
 
-        if (!(first is NoDataReturnedCall))
+        if (first is not NoDataReturnedCall)
         {
             await first.PostprocessAsync(reader, exceptions, token).ConfigureAwait(false);
             try

src/Marten/Linq/Parsing/SimpleExpression.cs

@@ -328,7 +328,7 @@ protected override Expression VisitMethodCall(MethodCallExpression node)
             return null;
         }
 
-        if (node.Object == null && !(node.Arguments.FirstOrDefault() is MemberExpression))
+        if (node.Object == null && node.Arguments.FirstOrDefault() is not MemberExpression)
         {
             // It's a method of a static, so this has to be a constant
             HasConstant = true;