revert incr/decr changes

Author: tillkruss

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 ## Unreleased
 - Changed `wp_cache_*()` function signatures to match core
+- Revert (in|de)crement changes from v2.6.0
 
 ## 2.6.5
 

includes/object-cache.php

@@ -2410,14 +2410,9 @@ public function increment( $key, $offset = 1, $group = 'default' ) {
         }
 
         try {
-            $value = (int) $this->parse_redis_response( $this->maybe_unserialize( $this->redis->get( $derived_key ) ) );
-            $value += $offset;
-            $result = $this->parse_redis_response( $this->redis->set( $derived_key, $this->maybe_serialize( $value ) ) );
+            $result = $this->parse_redis_response( $this->redis->incrBy( $derived_key, $offset ) );
 
-            if ( $result ) {
-                $this->add_to_internal_cache( $derived_key, $value );
-                $result = $value;
-            }
+            $this->add_to_internal_cache( $derived_key, (int) $this->redis->get( $derived_key ) );
         } catch ( Exception $exception ) {
             $this->handle_exception( $exception );
 
@@ -2472,14 +2467,9 @@ public function decrement( $key, $offset = 1, $group = 'default' ) {
         }
 
         try {
-            $value = (int) $this->parse_redis_response( $this->maybe_unserialize( $this->redis->get( $derived_key ) ) );
-            $value -= $offset;
-            $result = $this->parse_redis_response( $this->redis->set( $derived_key, $this->maybe_serialize( $value ) ) );
+            $result = $this->parse_redis_response( $this->redis->decrBy( $derived_key, $offset ) );
 
-            if ( $result ) {
-                $this->add_to_internal_cache( $derived_key, $value );
-                $result = $value;
-            }
+            $this->add_to_internal_cache( $derived_key, (int) $this->redis->get( $derived_key ) );
         } catch ( Exception $exception ) {
             $this->handle_exception( $exception );