joyent/node — pull request #8617 by hustxiaoc (2014-10-25 05:09:27+00:00)
Title: add cache for module with same version

In a large project developed with node.Js, some modules are used frequently, let's say ```underscore``` or ```lodash```, module A is depended on it,and module B is depended on it too, they are depended on the same version. So module ```underscore``` is loaded twice , right? and that may cost more memory, so why don't we set the cache for the same module with the same version. Thanks!