Object cache ignores the group parameter

As a result, caches are flushed almost instantly after being set.

The file affected: ObjectCache_WpObjectCache_Regular.php

Plugin version: 2.3.3

The patch:

153c153
< 			$v = $cache->get( $key );
---
> 			$v = $cache->get( $key, $group );
293c293
< 				( $expire ? $expire : $this->_lifetime ) );
---
> 				( $expire ? $expire : $this->_lifetime ), $group );
351c351
< 			$return = $cache->delete( $key );
---
> 			$return = $cache->delete( $key, $group );

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