[BUGFIX release] Setup named positionalParam array.

Previously, when `positionalParams` was a string value (which means to
set all params as an array at that particular prop in `attrs`) we were
iterating over the length of the destination property name instead of
the available `params`.

packages/ember-htmlbars/lib/node-managers/component-node-manager.js

@@ -136,11 +136,14 @@ function processPositionalParams(renderNode, positionalParams, params, attrs) {
     attrs[positionalParams] = paramsStream;
   }
 
-  for (let i = 0; i < positionalParams.length; i++) {
-    let param = params[paramsStartIndex + i];
-    if (isNamed) {
+  if (isNamed) {
+    for (let i = paramsStartIndex; i < params.length; i++) {
+      let param = params[i];
       paramsStream.addDependency(param);
-    } else {
+    }
+  } else {
+    for (let i = 0; i < positionalParams.length; i++) {
+      let param = params[paramsStartIndex + i];
       attrs[positionalParams[i]] = param;
     }
   }

packages/ember-htmlbars/tests/integration/component_invocation_test.js

@@ -572,9 +572,9 @@ QUnit.test('static arbitrary number of positional parameters', function() {
 QUnit.test('dynamic arbitrary number of positional parameters', function() {
   var SampleComponent = Component.extend();
   SampleComponent.reopenClass({
-    positionalParams: 'names'
+    positionalParams: 'n'
   });
-  registry.register('template:components/sample-component', compile('{{#each attrs.names as |name|}}{{name}}{{/each}}'));
+  registry.register('template:components/sample-component', compile('{{#each attrs.n as |name|}}{{name}}{{/each}}'));
   registry.register('component:sample-component', SampleComponent);
 
   view = EmberView.extend({
@@ -597,6 +597,13 @@ QUnit.test('dynamic arbitrary number of positional parameters', function() {
 
   equal(view.$('#direct').text(), 'Bar5');
   equal(view.$('#helper').text(), 'Bar5');
+
+  run(function() {
+    set(view.context, 'user2', '6');
+  });
+
+  equal(view.$('#direct').text(), 'Bar6');
+  equal(view.$('#helper').text(), 'Bar6');
 });
 
 QUnit.test('moduleName is available on _renderNode when a layout is present', function() {