Merge pull request #2696 from PaulMaly/patch-1

Make component.$$.dirty just a dictionary

src/internal/Component.js

@@ -48,7 +48,7 @@ function make_dirty(component, key) {
 	if (!component.$$.dirty) {
 		dirty_components.push(component);
 		schedule_update();
-		component.$$.dirty = {};
+		component.$$.dirty = blank_object();
 	}
 	component.$$.dirty[key] = true;
 }
@@ -188,4 +188,4 @@ export class SvelteComponentDev extends SvelteComponent {
 			console.warn(`Component was already destroyed`); // eslint-disable-line no-console
 		};
 	}
-}
+}