3 files changed, 1 insertions, 15 deletions
diff --git a/activesupport/lib/active_support/json/encoders/hash.rb b/activesupport/lib/active_support/json/encoders/hash.rb
index 3654e10b2e..9a9f074847 100644
--- a/activesupport/lib/active_support/json/encoders/hash.rb
+++ b/activesupport/lib/active_support/json/encoders/hash.rb
@@ -2,8 +2,6 @@ class Hash
   def to_json #:nodoc:
     returning result = '{' do
       result << map do |key, value|
-        key = ActiveSupport::JSON::Variable.new(key.to_s) if 
-          ActiveSupport::JSON.can_unquote_identifier?(key)
         "#{ActiveSupport::JSON.encode(key)}: #{ActiveSupport::JSON.encode(value)}"
       end * ', '
       result << '}'
diff --git a/activesupport/lib/active_support/json/encoding.rb b/activesupport/lib/active_support/json/encoding.rb
index 64e5779b71..67656109c0 100644
--- a/activesupport/lib/active_support/json/encoding.rb
+++ b/activesupport/lib/active_support/json/encoding.rb
@@ -10,13 +10,6 @@ end
 
 module ActiveSupport
   module JSON
-    # When +true+, Hash#to_json will omit quoting string or symbol keys
-    # if the keys are valid JavaScript identifiers.  Note that this is
-    # technically improper JSON (all object keys must be quoted), so if
-    # you need strict JSON compliance, set this option to +false+.
-    mattr_accessor :unquote_hash_key_identifiers
-    @@unquote_hash_key_identifiers = true
-
     class CircularReferenceError < StandardError
     end
 
@@ -30,11 +23,6 @@ module ActiveSupport
         end
       end
 
-      def can_unquote_identifier?(key) #:nodoc:
-        unquote_hash_key_identifiers && 
-          ActiveSupport::JSON.valid_identifier?(key)
-      end
-
       protected
         def raise_on_circular_reference(value) #:nodoc:
           stack = Thread.current[REFERENCE_STACK_VARIABLE] ||= []
diff --git a/activesupport/lib/active_support/json/variable.rb b/activesupport/lib/active_support/json/variable.rb
index 325ac9b7a6..0af98f0968 100644
--- a/activesupport/lib/active_support/json/variable.rb
+++ b/activesupport/lib/active_support/json/variable.rb
@@ -1,6 +1,6 @@
 module ActiveSupport
   module JSON
-    # A string that returns itself as as its JSON-encoded form.
+    # A string that returns itself as its JSON-encoded form.
     class Variable < String
       def to_json
         self