ZF-12324: Zend_Mobile: GCM collapse_key does not encode as a string in json when using a numeric

Description

If you enter a numeric id, you will get a Zend_Mobile_Push_Exception_InvalidPayload Exception with the response: "Field "collapse_key" must be a JSON String".

Comments

Committed to trunk: 25021 Committed to release branch 1.12: 25022