Extend indifferent_params to support hashes nested within arrays.

lib/sinatra/base.rb

@@ -871,8 +871,10 @@ module Sinatra
     def indifferent_params(params)
       params = indifferent_hash.merge(params)
       params.each do |key, value|
-        next unless value.is_a?(Hash)
+        case value
-        params[key] = indifferent_params(value)
+          when Hash  then params[key] = indifferent_params(value)
+          when Array then params[key] = value.map { |item| indifferent_params(item) }
+        end
       end
     end
 

test/routing_test.rb

@@ -360,6 +360,18 @@ class RoutingTest < Test::Unit::TestCase
     assert_equal 'well, alright', body
   end
 
+  it "exposes params nested within arrays with indifferent hash" do
+    mock_app {
+      get '/testme' do
+        assert_equal 'baz', params['bar'][0]['foo']
+        assert_equal 'baz', params['bar'][0][:foo]
+        'well, alright'
+      end
+    }
+    get '/testme?bar[][foo]=baz'
+    assert_equal 'well, alright', body
+  end
+
   it "supports deeply nested params" do
     expected_params = {
       "emacs" => {