/**
* $params include:
* - caches: A numbered array of either ObjectFactory::getObjectFromSpec
- * arrays yeilding BagOStuff objects or direct BagOStuff objects.
+ * arrays yielding BagOStuff objects or direct BagOStuff objects.
* If using the former, the 'args' field *must* be set.
* The first cache is the primary one, being the first to
* be read in the fallback chain. Writes happen to all stores