fix

src/runtime/internal/Component.ts

@@ -44,14 +44,6 @@ export function bind(component, name, callback) {
 	}
 }
 
-export function create_component(block) {
-	block && block.c();
-}
-
-export function claim_component(block, parent_nodes) {
-	block && block.l(parent_nodes);
-}
-
 export function mount_component(component, target, anchor) {
 	const { fragment, on_mount, on_destroy, after_update } = component.$$;
 
@@ -139,7 +131,7 @@ export function init(component, options, instance, create_fragment, not_equal, p
 
 	$$.update();
 	ready = true;
-	$$.before_update.forEach(v => v());
+	for (let i = 0, { before_update } = $$; i < before_update.length; i++) before_update[i]();
 
 	// `false` as a special case of no DOM component
 	$$.fragment = create_fragment ? create_fragment($$.ctx) : false;

src/runtime/internal/dom.ts

@@ -1,3 +1,5 @@
+import { has_prop } from "./utils";
+
 export function append(target: Node, node: Node) {
 	target.appendChild(node);
 }
@@ -27,7 +29,7 @@ export function element_is<K extends keyof HTMLElementTagNameMap>(name: K, is: s
 export function object_without_properties<T, K extends string[]>(obj: T, excluded: K) {
 	const target = {} as Pick<T, Exclude<keyof T, keyof K>>;
 	let key;
-	for (key in obj) if (!~excluded.indexOf(key)) target[key] = obj[key];
+	for (key in obj) if (has_prop(obj, key) && !~excluded.indexOf(key)) target[key] = obj[key];
 	return target;
 }
 

src/runtime/internal/spread.ts

@@ -4,17 +4,16 @@ export function get_spread_update(levels, updates) {
 	const to_null_out = {};
 	const accounted_for = { $$scope: 1 };
 
-	let i = levels.length;
+	let i = levels.length,
+		key,
+		n;
 	while (i--) {
-		const o = levels[i];
-		const n = updates[i];
-
-		if (n) {
-			for (const key in o) {
+		if (n = updates[i]) {
+			for (key in levels[i]) {
 				if (!(key in n)) to_null_out[key] = 1;
 			}
 
-			for (const key in n) {
+			for (key in n) {
 				if (!accounted_for[key]) {
 					update[key] = n[key];
 					accounted_for[key] = 1;
@@ -23,13 +22,13 @@ export function get_spread_update(levels, updates) {
 
 			levels[i] = n;
 		} else {
-			for (const key in o) {
+			for (key in levels[i]) {
 				accounted_for[key] = 1;
 			}
 		}
 	}
 
-	for (const key in to_null_out) {
+	for ( key in to_null_out) {
 		if (!(key in update)) update[key] = undefined;
 	}
 

src/runtime/internal/ssr.ts

@@ -101,7 +101,7 @@ export function create_ssr_component(fn) {
 
 			const html = $$render(result, props, {}, options);
 
-			on_destroy.forEach(v => v());
+			for (let i = 0; i < on_destroy.length; i++) on_destroy[i]();
 
 			return {
 				html,

src/runtime/internal/utils.ts

@@ -33,3 +33,5 @@ export function set_store_value(store, ret, value = ret) {
 	store.set(value);
 	return ret;
 }
+
+export const has_prop = (obj, prop) => Object.prototype.hasOwnProperty.call(obj, prop);