ogier/pflag — pull request #2 by alecthomas (2012-12-20 06:42:27+00:00)
Title: Add ability to disable interspersed option support.

This is very useful in conjunction with FlagSets for supporting "commands" with differing sets of options.

eg.

```
cmd --loglevel=debug ls -la
cmd run --command=/bin/ls
```

Where the arguments to the `ls` and `run` commands are in different `FlagSet`s. Without this capability, `FlagSet`s are quite a bit less useful.