Series designation is case-sensitive

…which could lead to problems. See, for instance:

```
Chuunibyou Demo Koi ga Shitai! [6] 
Chuunibyou demo Koi ga Shitai! [7, 8] 
```

In this example, there's a 2/3 chance that episode 7 will be played before episode 6 and, if it is, a 1/2 chance that 8 will _also_ be played before 6. Less than ideal.
