diff --git a/lib/couchrest/model/property.rb b/lib/couchrest/model/property.rb
index fd2e104..abefaab 100644
--- a/lib/couchrest/model/property.rb
+++ b/lib/couchrest/model/property.rb
@@ -33,7 +33,7 @@ module CouchRest::Model
           data.keys.sort.each do |k|
             value << data[k]
           end
-        elsif value.class != Array
+        elsif !value.is_a?(Array)
           raise "Expecting an array or keyed hash for property #{parent.class.name}##{self.name}"
         end
         arr = value.collect { |data| cast_value(parent, data) }
@@ -72,12 +72,12 @@ module CouchRest::Model
       def parse_type(type)
         if type.nil?
           @casted = false
-          @type = nil 
+          @type = nil
           @type_class = nil
         else
           base = type.is_a?(Array) ? type.first : type
           base = Object if base.nil?
-          raise "Defining a property type as a #{type.class.name.humanize} is not supported in CouchRest Model!" if base.class != Class 
+          raise "Defining a property type as a #{type.class.name.humanize} is not supported in CouchRest Model!" if base.class != Class
           @type_class = base
           @type = type
         end
diff --git a/spec/couchrest/casted_model_spec.rb b/spec/couchrest/casted_model_spec.rb
index 60fb3e0..dd4da5b 100644
--- a/spec/couchrest/casted_model_spec.rb
+++ b/spec/couchrest/casted_model_spec.rb
@@ -31,11 +31,11 @@ class WithCastedCallBackModel < Hash
   property :name
   property :run_before_validate
   property :run_after_validate
-  
+
   before_validate do |object|
     object.run_before_validate = true
   end
-  after_validate do |object| 
+  after_validate do |object|
     object.run_after_validate = true
   end
 end
@@ -47,7 +47,7 @@ class CastedCallbackDoc < CouchRest::Model::Base
 end
 
 describe CouchRest::Model::CastedModel do
-  
+
   describe "A non hash class including CastedModel" do
     it "should fail raising and include error" do
       lambda do
@@ -55,27 +55,27 @@ describe CouchRest::Model::CastedModel do
           include CouchRest::CastedModel
           property :name
         end
-        
+
       end.should raise_error
     end
   end
-  
+
   describe "isolated" do
     before(:each) do
       @obj = WithCastedModelMixin.new
     end
     it "should automatically include the property mixin and define getters and setters" do
       @obj.name = 'Matt'
-      @obj.name.should == 'Matt' 
+      @obj.name.should == 'Matt'
     end
-    
+
     it "should allow override of default" do
       @obj = WithCastedModelMixin.new(:name => 'Eric', :details => {'color' => 'orange'})
       @obj.name.should == 'Eric'
       @obj.details['color'].should == 'orange'
     end
   end
-  
+
   describe "casted as an attribute, but without a value" do
     before(:each) do
       @obj = DummyModel.new
@@ -99,22 +99,22 @@ describe CouchRest::Model::CastedModel do
       @obj.sub_models.first.title.should eql('test')
     end
   end
-  
+
   describe "casted as attribute" do
     before(:each) do
       casted = {:name => 'not whatever'}
       @obj = DummyModel.new(:casted_attribute => {:name => 'whatever', :casted_attribute => casted})
       @casted_obj = @obj.casted_attribute
     end
-    
+
     it "should be available from its parent" do
       @casted_obj.should be_an_instance_of(WithCastedModelMixin)
     end
-    
+
     it "should have the getters defined" do
       @casted_obj.name.should == 'whatever'
     end
-    
+
     it "should know who casted it" do
       @casted_obj.casted_by.should == @obj
     end
@@ -126,11 +126,11 @@ describe CouchRest::Model::CastedModel do
     it "should return nil for the unknown attribute" do
       @casted_obj["unknown"].should be_nil
     end
-    
+
     it "should return {} for the hash attribute" do
       @casted_obj.details.should == {}
     end
-    
+
     it "should cast its own attributes" do
       @casted_obj.casted_attribute.should be_instance_of(WithCastedModelMixin)
     end
@@ -140,18 +140,18 @@ describe CouchRest::Model::CastedModel do
       expect { @casted_obj.casted_attribute.update_attributes(:name => "Fubar") }.to raise_error(NoMethodError)
     end
   end
-  
+
   describe "casted as an array of a different type" do
     before(:each) do
       @obj = DummyModel.new(:keywords => ['couch', 'sofa', 'relax', 'canapé'])
     end
-    
+
     it "should cast the array properly" do
       @obj.keywords.should be_an_instance_of(Array)
       @obj.keywords.first.should == 'couch'
     end
   end
-  
+
   describe "update attributes without saving" do
     before(:each) do
       @question = Question.new(:q => "What is your quest?", :a => "To seek the Holy Grail")
@@ -163,20 +163,20 @@ describe CouchRest::Model::CastedModel do
       @question['q'].should == "What is your favorite color?"
       @question.a.should == "Blue"
     end
-    
+
     it "should also work for attributes= alias" do
       @question.respond_to?(:attributes=).should be_true
       @question.attributes = {:q => "What is your favorite color?", 'a' => "Blue"}
       @question['q'].should == "What is your favorite color?"
       @question.a.should == "Blue"
     end
-    
+
     it "should flip out if an attribute= method is missing" do
       lambda {
         @q.update_attributes_without_saving('foo' => "something", :a => "No green")
       }.should raise_error(NoMethodError)
     end
-    
+
     it "should not change any attributes if there is an error" do
       lambda {
         @q.update_attributes_without_saving('foo' => "something", :a => "No green")
@@ -186,7 +186,7 @@ describe CouchRest::Model::CastedModel do
     end
 
   end
-  
+
   describe "saved document with casted models" do
     before(:each) do
       reset_test_db!
@@ -194,24 +194,24 @@ describe CouchRest::Model::CastedModel do
       @obj.save.should be_true
       @obj = DummyModel.get(@obj.id)
     end
-    
+
     it "should be able to load with the casted models" do
       casted_obj = @obj.casted_attribute
       casted_obj.should_not be_nil
       casted_obj.should be_an_instance_of(WithCastedModelMixin)
     end
-    
+
     it "should have defined getters for the casted model" do
       casted_obj = @obj.casted_attribute
       casted_obj.name.should == "whatever"
     end
-    
+
     it "should have defined setters for the casted model" do
       casted_obj = @obj.casted_attribute
       casted_obj.name = "test"
       casted_obj.name.should == "test"
     end
-    
+
     it "should retain an override of a casted model attribute's default" do
       casted_obj = @obj.casted_attribute
       casted_obj.details['color'] = 'orange'
@@ -219,7 +219,7 @@ describe CouchRest::Model::CastedModel do
       casted_obj = DummyModel.get(@obj.id).casted_attribute
       casted_obj.details['color'].should == 'orange'
     end
-    
+
   end
 
   describe "saving document with array of casted models and validation" do
@@ -244,7 +244,7 @@ describe CouchRest::Model::CastedModel do
       @cat.should_not be_valid
       @cat.save.should be_false
     end
-    
+
     it "should not fail if the casted model doesn't have validation" do
       Cat.property :masters, [Person], :default => []
       Cat.validates_presence_of :name
@@ -254,7 +254,7 @@ describe CouchRest::Model::CastedModel do
       cat.should be_valid
     end
   end
-  
+
   describe "calling valid?" do
     before :each do
       @cat = Cat.new
@@ -265,7 +265,7 @@ describe CouchRest::Model::CastedModel do
       @cat.toys << @toy2
       @cat.toys << @toy3
     end
-    
+
     describe "on the top document" do
       it "should put errors on all invalid casted models" do
         @cat.should_not be_valid
@@ -274,10 +274,10 @@ describe CouchRest::Model::CastedModel do
         @toy2.errors.should_not be_empty
         @toy3.errors.should_not be_empty
       end
-      
+
       it "should not put errors on valid casted models" do
         @toy1.name = "Feather"
-        @toy2.name = "Twine" 
+        @toy2.name = "Twine"
         @cat.should_not be_valid
         @cat.errors.should_not be_empty
         @toy1.errors.should be_empty
@@ -285,7 +285,7 @@ describe CouchRest::Model::CastedModel do
         @toy3.errors.should_not be_empty
       end
     end
-    
+
     describe "on a casted model property" do
       it "should only validate itself" do
         @toy1.should_not be_valid
@@ -295,7 +295,7 @@ describe CouchRest::Model::CastedModel do
         @toy3.errors.should be_empty
       end
     end
-    
+
     describe "on a casted model inside a casted collection" do
       it "should only validate itself" do
         @toy2.should_not be_valid
@@ -306,7 +306,7 @@ describe CouchRest::Model::CastedModel do
       end
     end
   end
-  
+
   describe "calling new? on a casted model" do
     before :each do
       reset_test_db!
@@ -315,18 +315,18 @@ describe CouchRest::Model::CastedModel do
       @cat.favorite_toy = @favorite_toy
       @cat.toys << CatToy.new(:name => 'Fuzzy Stick')
     end
-    
+
     it "should be true on new" do
       CatToy.new.should be_new
       CatToy.new.new_record?.should be_true
     end
-    
+
     it "should be true after assignment" do
       @cat.should be_new
       @cat.favorite_toy.should be_new
       @cat.toys.first.should be_new
     end
-    
+
     it "should not be true after create or save" do
       @cat.create
       @cat.save
@@ -334,14 +334,14 @@ describe CouchRest::Model::CastedModel do
       @cat.toys.first.casted_by.should eql(@cat)
       @cat.toys.first.should_not be_new
     end
-    
+
     it "should not be true after get from the database" do
       @cat.save
       @cat = Cat.get(@cat.id)
       @cat.favorite_toy.should_not be_new
       @cat.toys.first.should_not be_new
     end
-    
+
     it "should still be true after a failed create or save" do
       @cat.name = nil
       @cat.create.should be_false
@@ -350,7 +350,7 @@ describe CouchRest::Model::CastedModel do
       @cat.toys.first.should be_new
     end
   end
-  
+
   describe "calling base_doc from a nested casted model" do
     before :each do
       @course = Course.new(:title => 'Science 101')
@@ -363,7 +363,15 @@ describe CouchRest::Model::CastedModel do
       @cat.favorite_toy = @toy1
       @cat.toys << @toy2
     end
-    
+
+    it 'should let you copy over casted arrays' do
+      question = Question.new
+      @course.questions << question
+      new_course = Course.new
+      new_course.questions = @course.questions
+      new_course.questions.should include(question)
+    end
+
     it "should reference the top document for" do
       @course.base_doc.should === @course
       @professor.casted_by.should === @course
@@ -372,19 +380,19 @@ describe CouchRest::Model::CastedModel do
       @toy1.base_doc.should === @course
       @toy2.base_doc.should === @course
     end
-    
+
     it "should call setter on top document" do
       @toy1.base_doc.should_not be_nil
       @toy1.base_doc.title = 'Tom Foolery'
       @course.title.should == 'Tom Foolery'
     end
-    
+
     it "should return nil if not yet casted" do
       person = Person.new
       person.base_doc.should == nil
     end
   end
-  
+
   describe "calling base_doc.save from a nested casted model" do
     before :each do
       reset_test_db!
@@ -392,13 +400,13 @@ describe CouchRest::Model::CastedModel do
       @toy = CatToy.new
       @cat.favorite_toy = @toy
     end
-    
+
     it "should not save parent document when casted model is invalid" do
       @toy.should_not be_valid
       @toy.base_doc.save.should be_false
       lambda{@toy.base_doc.save!}.should raise_error
     end
-    
+
     it "should save parent document when nested casted model is valid" do
       @toy.name = "Mr Squeaks"
       @toy.should be_valid
@@ -406,14 +414,14 @@ describe CouchRest::Model::CastedModel do
       lambda{@toy.base_doc.save!}.should_not raise_error
     end
   end
-  
+
   describe "callbacks" do
     before(:each) do
       @doc = CastedCallbackDoc.new
       @model = WithCastedCallBackModel.new
       @doc.callback_model = @model
     end
-    
+
     describe "validate" do
       it "should run before_validate before validating" do
         @model.run_before_validate.should be_nil
@@ -424,7 +432,7 @@ describe CouchRest::Model::CastedModel do
         @model.run_after_validate.should be_nil
         @model.should be_valid
         @model.run_after_validate.should be_true
-      end      
+      end
     end
   end
 end