.not() appears to always return false, rather than inverting booleans

[Jack Mott]

Bacon.version 0.7.83 from nuget

Following along this tutorial here:
https://baconjs.github.io/tutorials.html

 var availabilityResponse = availabilityRequest.ajax();
 var usernameAvailable = availabilityResponse.toProperty(true);            
 usernameAvailable.not().onValue(setVisibility, unavailabilityLabel);

usernameAvailable.not() appears to return false no matter what usernameAvailable is, as usernameAvailable changes from ajax events. It does work properly with the initial property setting (ie, if you change toProperty(false) above, usernameAvailable.not().log() return true.

[Jack Mott]

ah, I think this is because ajax is returning the strings true and false, and not booleans. This might be a bug in the tutorial but not in baconjs.