Fix bug. Update readme.

README.md

@@ -24,6 +24,10 @@ The `Collection` class implements `ArrayAccess` and `Countable` interface intern
 * `empty()`, `count()` can be used on instance of `Collection`.
 * Elements can be traversed via `foreach()` keyword.
 
+### 2.3 Notes
+
+* The `Collection::xxxTo()` methods will preserve the original key-value pairs of destination `Collection` when keys collide.
+
 ## 3. Example
 
 Here is a simple example for how to work with arrays gracefully using this extension.

src/collections_methods.c

@@ -820,7 +820,7 @@ PHP_METHOD(Collection, get)
         found = zend_hash_index_find(current, Z_LVAL_P(key));
     else {
         ERR_BAD_KEY_TYPE();
-        RETVAL_NULL();
+        RETURN_NULL();
     }
     if (found)
         RETURN_ZVAL(found, 1, 0);