[WIP][BUGFIX Beta] Positional param clash on rerender of contextual component helper

packages/ember-htmlbars/lib/utils/extract-positional-params.js

@@ -1,6 +1,6 @@
 import { assert } from 'ember-metal/debug';
 import { Stream } from 'ember-metal/streams/stream';
-import { readArray } from 'ember-metal/streams/utils';
+import { isStream, readArray } from 'ember-metal/streams/utils';
 
 export default function extractPositionalParams(renderNode, component, params, attrs) {
   let positionalParams = component.positionalParams;
@@ -25,9 +25,10 @@ function processNamedPositionalParameters(renderNode, positionalParams, params,
 
   for (let i = 0; i < limit; i++) {
     let param = params[i];
+    let isActiveStreamParam = isStream(param) && param.isActive;
 
     assert(`You cannot specify both a positional param (at position ${i}) and the hash argument \`${positionalParams[i]}\`.`,
-           !(positionalParams[i] in attrs));
+           isActiveStreamParam || !(positionalParams[i] in attrs));
 
     attrs[positionalParams[i]] = param;
   }

packages/ember-htmlbars/tests/helpers/closure_component_test.js

@@ -339,6 +339,38 @@ if (isEnabled('ember-contextual-components')) {
     }, `You cannot specify both a positional param (at position 0) and the hash argument \`name\`.`);
   });
 
+  QUnit.test('conflicting positional and hash parameters does not raise and assertion if rerendered', function() {
+    let LookedUp = Component.extend();
+    LookedUp.reopenClass({
+      positionalParams: ['name']
+    });
+    owner.register(
+      'component:-looked-up',
+      LookedUp
+    );
+    owner.register(
+      'template:components/-looked-up',
+      compile(`{{greeting}} {{name}}`)
+    );
+
+    let template = compile(
+      `{{component (component "-looked-up" name greeting="Hodi")}}`
+    );
+
+    component = Component.extend({
+      [OWNER]: owner,
+      template,
+      name: 'Hodari'
+    }).create();
+
+    runAppend(component);
+    equal(component.$().text(), 'Hodi Hodari', 'component is rendered');
+
+    run(() => component.set('name', 'Sergio'));
+
+    equal(component.$().text(), 'Hodi Sergio', 'component is rendered');
+  });
+
   QUnit.test('conflicting positional and hash parameters does not raise and assertion if in the different closure', function() {
     let LookedUp = Component.extend();
     LookedUp.reopenClass({