mikel/mail — pull request #504 by bpot (2013-01-30 23:42:22+00:00)
Title: Treat GB2312 encodings as GB18030

```
GB 18030 character assignments are backwards compatible with the GB 2312-1980 standard and the GBK specification.
```

http://icu-project.org/docs/papers/gb18030.html