fix: fix comparison between two values ​​that are not objects

src/diff.js

@@ -2,8 +2,5 @@ import perform from './perform'
 import wrap from './wrap'
 
 export default function diff (original, derived) {
-  return perform(
-    wrap(typeof original === 'object' ? original : {}),
-    wrap(typeof derived === 'object' ? derived : {})
-  )
+  return perform(wrap(original), wrap(derived))
 }

src/perform.js

@@ -5,6 +5,10 @@ import getProperties from './getProperties'
 import heap from './heap'
 
 export default function perform (originalWrapped, derivedWrapped) {
+  if (originalWrapped.type !== 'object' && derivedWrapped.type !== 'object') {
+    return [getChange(originalWrapped, derivedWrapped)]
+  }
+
   const properties = getProperties(originalWrapped.value, derivedWrapped.value)
 
   return properties.reduce((result, property) => {

test/diff.spec.js

@@ -28,26 +28,4 @@ describe('diff', () => {
     expect(wrap.mock.calls).toEqual([[original], [derived]])
     expect(perform).toBeCalledWith(originalWrapped, derivedWrapped)
   })
-
-  describe('when "original" isn`t an object', () => {
-    it('calls the respective "wrap" with an empty object', () => {
-      const original = 'original'
-      const derived = {}
-
-      diff(original, derived)
-
-      expect(wrap.mock.calls).toEqual([[{}], [derived]])
-    })
-  })
-
-  describe('when "derived" isn`t an object', () => {
-    it('calls the respective "wrap" with an empty object', () => {
-      const original = {}
-      const derived = 'derived'
-
-      diff(original, derived)
-
-      expect(wrap.mock.calls).toEqual([[original], [{}]])
-    })
-  })
 })

test/perform.spec.js

@@ -114,7 +114,9 @@ describe('perform', () => {
           anotherProperty: 'another value'
         }
       ]
-    ]
+    ],
+    /* 16 */
+    ['value', 'different value']
   ].map(objects => objects.map(object => wrap(object)))
 
   const expectations = [
@@ -385,6 +387,18 @@ describe('perform', () => {
         },
         previous: 'other value'
       }
+    ],
+    /* 16 */
+    [
+      {
+        type: 'change',
+        path: {
+          string: '',
+          chain: []
+        },
+        previous: 'value',
+        value: 'different value'
+      }
     ]
   ]