cast

# File activerecord/lib/active_record/connection_adapters/postgresql/oid/array.rb, line 34
          def cast(value)
            if value.is_a?(::String)
              value = begin
                @pg_decoder.decode(value)
              rescue TypeError
                # malformed array string is treated as [], will raise in PG 2.0 gem
                # this keeps a consistent implementation
                []
              end
            end
            type_cast_array(value, :cast)
          end