Prevent delegation of columns which are both in master and version

lib/sequel/plugins/bitemporal.rb

@@ -61,6 +61,7 @@ def self.configure(master, opts = {})
           @propagate_per_column = opts.fetch(:propagate_per_column, false)
           @version_uses_string_nilifier = version.plugins.map(&:to_s).include? "Sequel::Plugins::StringNilifier"
           @excluded_columns = Sequel::Plugins::Bitemporal.bitemporal_excluded_columns
+          @excluded_columns += columns
           @excluded_columns += Array opts[:excluded_columns] if opts[:excluded_columns]
           @use_ranges = if opts[:ranges]
             db = self.db

spec/bitemporal_date_spec.rb

@@ -552,6 +552,22 @@
     expect{ master.name }.to raise_error NoMethodError
     master.price.should == 98
   end
+  it "avoids delegation of columns which are both in master and version" do
+    closure = @version_class
+    DB.create_table! :rooms_with_name do
+      primary_key :id
+      String      :name
+    end
+    without_delegation_class = Class.new Sequel::Model do
+      set_dataset :rooms_with_name
+      plugin :bitemporal, version_class: closure
+    end
+    master = without_delegation_class.new name: "Master Hotel"
+    master.attributes = {name: "Single Standard", price: 98}
+    master.name.should == "Master Hotel"
+    master.price.should == 98
+    DB.drop_table :rooms_with_name
+  end
   it "get current_version association name from class name" do
     class MyNameVersion < Sequel::Model
       set_dataset :room_versions