Added support for direct assignment of an array element and triggerin…

…g reactivity.

src/lib/reactivity/effect.js

@@ -58,6 +58,7 @@ export const track = (target, key) => {
 }
 
 export const trigger = (target, key, force = false) => {
+  if (paused) return
   const effectsMap = objectMap.get(target)
   if (!effectsMap) {
     return

src/lib/reactivity/reactive.js

@@ -89,7 +89,11 @@ const reactiveProxy = (original, _parent = null, _key) => {
         result = Reflect.set(target, key, value, receiver)
       }
 
-      if (result && oldRawValue !== value) {
+      if (result && oldRawValue !== rawValue) {
+        // if we're assigning an array key directly trigger reactivity on the parent key as well
+        if (Array.isArray(target) && key in target) {
+          trigger(_parent, _key, true)
+        }
         trigger(target, key, true)
       }
       return result