+ something/package
+ something/package
- some#thing/package
+ =cat/package-1.0:0/2.0
- something/pac?kage
- =something/+package-1.0:3.0
- a b c 

+ >=media-video/knob-goblin-1.0_alpha-r4
+ media-video/knobgoblin:4

- /hello
- group/-1.0
- >=/
- >=media-video/revised-knob-3.0aaaaaaaaa-r15

*** sanity check
> cat/test-2.0 cat/test-1.0
< cat/test-1.0 cat/test-2.0