2 files changed, 6 insertions, 7 deletions
diff --git a/activesupport/lib/active_support/core_ext/hash/except.rb b/activesupport/lib/active_support/core_ext/hash/except.rb
index 8362cd880e..bc97fa35a6 100644
--- a/activesupport/lib/active_support/core_ext/hash/except.rb
+++ b/activesupport/lib/active_support/core_ext/hash/except.rb
@@ -10,13 +10,14 @@ module ActiveSupport #:nodoc:
       module Except
         # Returns a new hash without the given keys.
         def except(*keys)
-          rejected = Set.new(respond_to?(:convert_key) ? keys.map { |key| convert_key(key) } : keys)
-          reject { |key,| rejected.include?(key) }
+          clone.except!(*keys)
         end
 
         # Replaces the hash without only the given keys.
         def except!(*keys)
-          replace(except(*keys))
+          keys.map! { |key| convert_key(key) } if respond_to?(:convert_key)
+          keys.each { |key| delete(key) }
+          self
         end
       end
     end
diff --git a/activesupport/lib/active_support/core_ext/hash/slice.rb b/activesupport/lib/active_support/core_ext/hash/slice.rb
index 1b2c8f63e3..be4dec6e53 100644
--- a/activesupport/lib/active_support/core_ext/hash/slice.rb
+++ b/activesupport/lib/active_support/core_ext/hash/slice.rb
@@ -1,5 +1,3 @@
-require 'set'
-
 module ActiveSupport #:nodoc:
   module CoreExtensions #:nodoc:
     module Hash #:nodoc:
@@ -14,9 +12,9 @@ module ActiveSupport #:nodoc:
       module Slice
         # Returns a new hash with only the given keys.
         def slice(*keys)
-          allowed = Set.new(respond_to?(:convert_key) ? keys.map { |key| convert_key(key) } : keys)
+          keys = keys.map! { |key| convert_key(key) } if respond_to?(:convert_key)
           hash = {}
-          allowed.each { |k| hash[k] = self[k] if has_key?(k) }
+          keys.each { |k| hash[k] = self[k] if has_key?(k) }
           hash
         end