https://github.com/malomalo/activerecord-filter/blob/50fce177a0577a256e97cb7baae34f93ce058bf4/lib/active_record/filter.rb#L125 and https://github.com/malomalo/activerecord-filter/blob/50fce177a0577a256e97cb7baae34f93ce058bf4/lib/active_record/filter.rb#L131 require "AND" and "OR" to be uppercase, but we should also support lowercase
