Cache not set by entitycache module due to cid as number

I found the issue when using entitycache module with filecache. Filecache expects cid to be a string but entitycache is passing it as a integer. This is causing entitycache module to not able to persist cache. Since cid has not been defined as a string in Drupal core so I am not expecting any caching module to pass it necessarily as a string. I would suggest the below patch to fix this issue for the time being.

Index: filecache.inc
===================================================================
--- filecache.inc	(revision 1)
+++ filecache.inc	(revision 2)
@@ -218,7 +218,7 @@
    *   The cache or FALSE on failure.
    */
   function get($cid) {
-    if (!$this->ok || !is_string($cid)) {
+    if ( ( ! $this->ok ) || ( ! ( is_string($cid) || is_integer($cid) || is_float($cid) ) ) ) {
       return FALSE;
     }
 
@@ -322,7 +322,7 @@
    *     the given time, after which it behaves like CACHE_TEMPORARY.
    */
   function set($cid, $data, $expire = CACHE_PERMANENT) {
-    if (!is_string($cid)) {
+	  if ( ! ( is_string($cid) || is_integer($cid) || is_float($cid) ) ) {
       return;
     }