[Developers] mql boolean constraint

[Dae Park]

If I have a unique property (i.e., /type/foo/bar) who's expected type  
is /type/boolean, does providing a "false" constraint on that  
property also match those that have null values for that property.  
For example:

[{
   id: null,
   type: "/type/foo",
   bar: false
}]

Will this give me all instances of /type/foo that has not yet set a  
boolean value for the "bar" property?

-dae