FileTest return values
It would be more convenient if FileTest.directory? and FileTest.file? and perhaps some other FileTest methods returned the receiver if true, rather than just true value. That would allow the test to be used with assignments. E.g.
dir = FileTest.directory?('/home')
dir = '/home' if FileTest.directory?('/home')
The change is backward compatible. However, it would effect Pathname, which may need to be adjusted to take this into account properly.