Yield array from AC::Parameters#each for block with one arg

Matches Hash#each behaviour as used in Rails 4.

actionpack/lib/action_controller/metal/strong_parameters.rb

@@ -335,7 +335,7 @@ def to_unsafe_h
     # the same way as <tt>Hash#each_pair</tt>.
     def each_pair(&block)
       @parameters.each_pair do |key, value|
-        yield key, convert_hashes_to_parameters(key, value)
+        yield [key, convert_hashes_to_parameters(key, value)]
       end
     end
     alias_method :each, :each_pair

actionpack/test/controller/parameters/accessors_test.rb

@@ -51,6 +51,14 @@ class ParametersAccessorsTest < ActiveSupport::TestCase
     @params.each { |key, value| assert_not(value.permitted?) if key == "person" }
   end
 
+  test "each returns key,value array for block with arity 1" do
+    @params.each do |arg|
+      assert_kind_of Array, arg
+      assert_equal "person", arg[0]
+      assert_kind_of ActionController::Parameters, arg[1]
+    end
+  end
+
   test "each_pair carries permitted status" do
     @params.permit!
     @params.each_pair { |key, value| assert(value.permitted?) if key == "person" }
@@ -60,6 +68,14 @@ class ParametersAccessorsTest < ActiveSupport::TestCase
     @params.each_pair { |key, value| assert_not(value.permitted?) if key == "person" }
   end
 
+  test "each_pair returns key,value array for block with arity 1" do
+    @params.each_pair do |arg|
+      assert_kind_of Array, arg
+      assert_equal "person", arg[0]
+      assert_kind_of ActionController::Parameters, arg[1]
+    end
+  end
+
   test "empty? returns true when params contains no key/value pairs" do
     params = ActionController::Parameters.new
     assert params.empty?