No documentation for the valid values for --name=fmt parameter in callstack evaluate

[akbyrd]

The help message mentions a name/format parameter.

Usage: morgue callstack <subcommand>:
   morgue callstack evaluate <project> [--name=fmt] <object>|<filename>
     Evaluate a specific object/file.

The set of valid values and their behavior does not seem to be documented. I can't find anything in the Backtrace documentation (it seems like none of the endpoints used by morgue are documented). I tried some format related values I stumbled across in the code, but none of them have any impact on the output.

I also tried some random nonsense values and realized that there's no validation for this parameter on either end of the request.

I'm using this command to obtain a symbolicated stack so I can parse file paths to make a guess at which system lead to a crash.