2013 03 25 null to bool
null == false // false
Okay, we know this. Null doesn't convert to boolean.
Now try this...
!null // true
Well, this is awkward.
The issue here is that Null can be converted to a boolean, it just isn't implicitly converted:
Boolean(null) // false
See The Abstract Equality Comparison Algorithm
Null is only implicitly converted if compared to