fix(core): Fix type error

Tim Blasi · Tim Blasi · commit 6c3c6060a587 · 2015-08-31T13:02:29.000-07:00
Ensure that values passed to `DomRenderer#setElementAttribute` are
strings. Currently, booleans can be passed to this method, resulting in
failures when running in Dart checked mode.
diff --git a/modules/angular2/src/core/compiler/view.ts b/modules/angular2/src/core/compiler/view.ts
@@ -184,7 +184,7 @@ export class AppView implements ChangeDispatcher, RenderEventDispatcher {
       if (b.isElementProperty()) {
         this.renderer.setElementProperty(elementRef, b.name, currentValue);
       } else if (b.isElementAttribute()) {
-        this.renderer.setElementAttribute(elementRef, b.name, currentValue);
+        this.renderer.setElementAttribute(elementRef, b.name, `${currentValue}`);
       } else if (b.isElementClass()) {
         this.renderer.setElementClass(elementRef, b.name, currentValue);
       } else if (b.isElementStyle()) {
