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@@ -774,7 +774,7 @@ module DataMapper
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     end
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     def loaded_set=(value)
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-      value << self
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+      value << self unless value.include?(self)
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       @loaded_set = value
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     end
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@@ -8,12 +8,12 @@ module DataMapper
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       def initialize(*types)
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         @types = types
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-        @set = SortedSet.new
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+        @set = Array.new
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       end
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       def <<(item)
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         raise ArgumentError.new("#{item.inspect} must be a kind of: #{@types.inspect}") unless @types.any? { |type| type === item }
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-        @set << item
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+        @set << item unless @set.include?(item)
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         return self
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       end
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@@ -37,8 +37,8 @@ describe DataMapper::Support::TypedSet do
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     s << 5
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     s << 3
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-    s.entries.first.should eql(0)
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-    s.entries.last.should eql(30)
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+    s.entries.first.should eql(8)
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+    s.entries.last.should eql(3)
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   end
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   it "should respond to blank?" do