lib/upsert/connection/postgresql.rb in upsert-2.0.0 vs lib/upsert/connection/postgresql.rb in upsert-2.0.1

@@ -5,10 +5,10 @@
       def bind_value(v)
         case v
         when Array
           # pg array escaping lifted from https://github.com/tlconnor/activerecord-postgres-array/blob/master/lib/activerecord-postgres-array/array.rb
           '{' + v.map do |vv|
-            vv = vv.to_s
+            vv = vv.to_s.dup
             vv.gsub! /\\/, '\&\&'
             vv.gsub! /'/, "''"
             vv.gsub! /"/, '\"'
             %{"#{vv}"}
           end.join(',') + '}'