Major Description
There appears to be a memory leak in the LRUCache used by the SelectorParser. We have a simple selector-based request/response implementation which means we create a new selector on every request and these appear to be sticking around despite the use of an LRUCache with a 10,000 entry limit. A quick look at the LRUCache code didn't reveal any obvious problems, so I'm not sure what's going on here. For the time being we are rolling back to 5.2.
