Okay, this feature is still broken, so I guess I'll necro my old thread and add some pictures cause people don't seem to get this.
First, a look at my library. Notice the three test books, markes #read:yes, #read:no, and #read:not_set.
Not I mark those books and tell it to create an epub catalog. this is what the
predefined list lets me choose:
And here are the results of using those options:
- true:

- false:

- unspecified:

- "":

And to repeat my two problems with this:
- This does not match up with the way true and false work in the search box
- This does not allow you to properly transfer a tristate flag!