fix(types): ref value type unwrapping should happen at creation time

test-dts/ref.test-d.ts

@@ -13,6 +13,12 @@ function foo(arg: number | Ref<number>) {
 
   // ref unwrapping
   expectType<number>(unref(arg))
+
+  // ref inner type should be unwrapped
+  const nestedRef = ref({
+    foo: ref(1)
+  })
+  expectType<Ref<{ foo: number }>>(nestedRef)
 }
 
 foo(1)

test-dts/watch.test-d.ts

@@ -52,3 +52,13 @@ watch(
   },
   { immediate: true }
 )
+
+// should provide correct ref.value inner type to callbacks
+const nestedRefSource = ref({
+  foo: ref(1)
+})
+
+watch(nestedRefSource, (v, ov) => {
+  expectType<{ foo: number }>(v)
+  expectType<{ foo: number }>(ov)
+})