isaacs/npm — Issue #1753: NPM throws an error when using the outdated() API method after using ls(). 
Author: slaskis
Created: 2011-11-22 14:32:08+00:00
State: open

It seems to be related to having nested dependencies. The cache key becomes an object instead of a string it seemed when i used node-inspector.

I have a very simple test case here:

https://gist.github.com/1385771