U/salnikov/dm 621

I didn't write down anything. But a quick summary of my thoughts is:

- The complexity level of the YAML spec is scary.
- XML is both complex and verbose.
- JSON lacks comments and has some other annoyances (e.g. all strings must be quoted)
- INI is simple, but doesn't provide any structure. There does not appear to be a universal section naming convention to indicate hierarchy, and if I want to set a key to a list of values, then I have to introduce some convention for serializing arrays to a value string.
- TOML: not finalized yet, and I also wish it were simpler.

If I had to do it over, I would probably go with JSON, embed comments in dummy keys, and live with the ugliness. I think Andy would prefer some version of the INI format instead. Are there other formats we should consider?