Allow #permit to take its list of permitted parameters as an array

actionpack/lib/action_controller/metal/strong_parameters.rb

@@ -196,7 +196,7 @@ def require(key)
     def permit(*filters)
       params = self.class.new
 
-      filters.each do |filter|
+      filters.flatten.each do |filter|
         case filter
         when Symbol, String then
           if has_key?(filter)

actionpack/test/controller/parameters/parameters_permit_test.rb

 require 'abstract_unit'
+require 'debugger'
 require 'action_controller/metal/strong_parameters'
 
 class ParametersPermitTest < ActiveSupport::TestCase
@@ -77,4 +78,8 @@ class ParametersPermitTest < ActiveSupport::TestCase
       ActionController::Parameters.permit_all_parameters = false
     end
   end
+  
+  test "permitting parameters as an array" do
+    assert_equal "32", @params[:person].permit([ :age ])[:age]
+  end
 end