Fixes some special-object-in-array cases

- Extra test for #18
- Some bugs similar to #23 and #31 where regexes and dates wouldn't be copied correctly across arrays

index.js

@@ -11,7 +11,6 @@
 function isMergeableObject(val) {
     var nonNullObject = val && typeof val === 'object'
 
-
     return nonNullObject
         && Object.prototype.toString.call(val) !== '[object RegExp]'
         && Object.prototype.toString.call(val) !== '[object Date]'
@@ -27,7 +26,7 @@ return function deepmerge(target, src) {
         src.forEach(function(e, i) {
             if (typeof dst[i] === 'undefined') {
                 dst[i] = e;
-            } else if (typeof e === 'object' && e !== null) {
+            } else if (isMergeableObject(e)) {
                 dst[i] = deepmerge(target[i], e);
             } else {
                 if (target.indexOf(e) === -1) {

test/merge.js

@@ -262,3 +262,41 @@ test('should work on array with null in it', function(t) {
     t.deepEqual(merge(target, src), expected)
     t.end()
 })
+
+test('null should be equal to null in an array', function(t) {
+    var target = [null, 'dude']
+    var source = [null, 'lol']
+
+    var expected = [null, 'dude', 'lol']
+    var actual = merge(target, source)
+
+    t.deepEqual(actual, expected)
+    t.end()
+})
+
+test('dates in an array should be compared correctly', function(t) {
+    var monday = new Date('2016-09-27T01:08:12.761Z')
+
+    var target = [monday, 'dude']
+    var source = [monday, 'lol']
+
+    var expected = [monday, 'dude', 'lol']
+    var actual = merge(target, source)
+
+    t.deepEqual(actual, expected)
+    t.end()
+})
+
+test('dates should copy correctly in an array', function(t) {
+    var monday = new Date('2016-09-27T01:08:12.761Z')
+    var tuesday = new Date('2016-09-28T01:18:12.761Z')
+
+    var target = [monday, 'dude']
+    var source = [tuesday, 'lol']
+
+    var expected = [monday, 'dude', tuesday, 'lol']
+    var actual = merge(target, source)
+
+    t.deepEqual(actual, expected)
+    t.end()
+})