Use a class for the cache entry objects
Use a class for the cache entry objects

We make a LOT of these things in production environments.  V8 prefers
for hot-path objects to be of a consistent shape, and using a ctor
class makes this module go a bit faster.

cyberthom/stale-lru-cache,isaacs/node-lru-cache,LiuJi-Jim/node-lru-cache,isaacs/node-lru-cache,cyberthom/stale-lru-cache,shalotelli/node-lru-cache,mikeszahaj/node-lru-cache,jmendiara/serialized-lru-cache,pgherveou/lru-cache,LaurentZuijdwijk/node-lru-cache,Jimbly/node-lru-cache