Is it possible to set arrays with `./bin/config`?
I tried:
```lang=sh
./bin/config set load-libraries ext-a/src/ ext-b/src/
./bin/config set load-libraries \[ ext-a/src/, ext-b/src/ \]
```
and variations, but always get:
```
Usage Exception: Too many arguments: expected one key and one value.
```
Quickly scanning over the code of [PhutilArgumentParser.php](https://secure.phabricator.com/diffusion/PHU/browse/master/src/parser/argument/PhutilArgumentParser.php) didn't give me any clue.
The follow-up question to this will probably be: Does it support maps? (e.g. for `uri.allowed-protocols` and `files.image-mime-types`)