diff --git i/src/conf.cr w/src/conf.cr
index b29ca84..eb7e0b4 100644
--- i/src/conf.cr
+++ w/src/conf.cr
@@ -89,7 +89,6 @@ module Ldif2json
         
       end.parse
 
-      puts "@coercions #{@coercions.inspect} @can_be_coerced #{@can_be_coerced.inspect} @can_be_coerced[\"foobar\"] #{@can_be_coerced["foobar"].inspect} @can_be_flattened #{@can_be_flattened.inspect} @can_be_flattened[\"foobar\"] #{@can_be_flattened["foobar"].inspect}"
       raise NormalError.new("cannot set types in join mode") if @mode == Mode::Join && @coercions.size > 0
       
     end