I mistakenly did not give a field, but a string instead in ` col.findOneAndUpdate('56cd129222222', ...`

Thinking the first index field would automatically be searched....

This caused the behavior to treat it as a empty document, when it's not exactly empty...nor is it a document that is empty.

The result was the first document being modified. This is confusing and I do not see a real life use case for this kind of behavior.

I would like to request that nothing is returned when a non blank arg is given.

ref http://stackoverflow.com/questions/35712746/mongodb-node-js-driver-findoneandupdate-behavior-without-a-field-given?noredirect=1#comment59102797_35712746