1 files changed, 1 insertions, 12 deletions
diff --git a/activerecord/lib/active_record/type/boolean.rb b/activerecord/lib/active_record/type/boolean.rb
index 978d16d524..f6a75512fd 100644
--- a/activerecord/lib/active_record/type/boolean.rb
+++ b/activerecord/lib/active_record/type/boolean.rb
@@ -10,19 +10,8 @@ module ActiveRecord
       def cast_value(value)
         if value == ''
           nil
-        elsif ConnectionAdapters::Column::TRUE_VALUES.include?(value)
-          true
         else
-          if !ConnectionAdapters::Column::FALSE_VALUES.include?(value)
-            ActiveSupport::Deprecation.warn(<<-MSG.squish)
-              You attempted to assign a value which is not explicitly `true` or `false`
-              to a boolean column. Currently this value casts to `false`. This will
-              change to match Ruby's semantics, and will cast to `true` in Rails 5.
-              If you would like to maintain the current behavior, you should
-              explicitly handle the values you would like cast to `false`.
-            MSG
-          end
-          false
+          !ConnectionAdapters::Column::FALSE_VALUES.include?(value)
         end
       end
     end