As it's not really good form for a module to start spraying random diagnostic things to STDOUT, these puts calls should probably be removed or at least walled off unless some kind of debugging variable is engaged.
These seem to have ended up in the packaged release of the gem.
Removing STDOUT chatter from main module
I agree as well, was wondering where these were coming from... 👍
Pushed a new version of the gem 2.5.3 that includes this.