rummik/node-optimist — comment on commit ae380bde53fa91a54b908919a58e1e39cfebce76
File: index.js line 128
By rummik:

This might want some expansion, since, I think it should allow preventing further action by returning false in the callback -- if that's the chosen route, I'd recommend changing 121 to fails.unshift(), and moving 132-134 to a callback.