Handle initialising range objects with nil for exclude end.

Author: aardvark179

src/main/ruby/truffleruby/core/range.rb

@@ -43,7 +43,7 @@ def initialize(first, last, exclude_end = false)
       end
     end
 
-    Primitive.range_initialize self, first, last, exclude_end
+    Primitive.range_initialize self, first, last, Primitive.as_boolean(exclude_end)
   end
   private :initialize