Carlos Mostek

This fixes (or implements depending on whether you consider this a feature or a bug :) ): https://github.com/jonschlinkert/is-plain-object/issues/26

Okay, I see you have specifically checking for this since pretty much the beginning, and I'm guessing because there are potentially other implications of setting a field called constructor in...

@pferrariuy I've created a PR start for this. The PR is not ready to go, and needs some work to make it generic, but should give you a good idea...