Expose EmbeddedCacheManager/Cache via JCacheManager/JCache unwrap(...) methods

The JSR-107 spec includes the CacheManager.unwrap(Class) and Cache.unwrap(Class) methods to allow access to underlying caching implementation. Currently, I can only unwrap the Cache/CacheManager instance to the concrete JCache/JCacheManager implementations. However, these classes do not expose the underlying infinispan Cache/EmbeddedCacheManager.

Ideally, I should be able to do the following:

javax.cache.Cache<K, V> jcache = Caching.getCache("name", ...);
org.infinispan.Cache<K, V> icache = jcache.unwrap(org.infinispan.Cache.class);

or

CacheManager jmanager = Caching.getCachingProvider().getCacheManager();
EmbeddedCacheManager imanager = jmanager.unwrap(EmbeddedCacheManager.class);
CacheContainer container = jmanager.unwrap(CacheContainer.class);