avoid const lookup. we know what these constants are in advance

activerecord/lib/active_record/log_subscriber.rb

@@ -10,10 +10,10 @@ module ActiveRecord
       sql  = event.payload[:sql].squeeze(' ')
 
       if odd?
-        name = color(name, :cyan, true)
+        name = color(name, CYAN, true)
         sql  = color(sql, nil, true)
       else
-        name = color(name, :magenta, true)
+        name = color(name, MAGENTA, true)
       end
 
       debug "  #{name}  #{sql}"
@@ -29,4 +29,4 @@ module ActiveRecord
   end
 end
 
-ActiveRecord::LogSubscriber.attach_to :active_record
+ActiveRecord::LogSubscriber.attach_to :active_record