[enhancement] Better params parsing?

[schiza]

It would be lovely, if params could be represented in a 'tree' way, for nested objects (hashes, arrays, etc.), that you can clearly read/collapse. For now, it's only a little bit help for reading params (especially when you are i.e. updating your model and sending nested hash of attributes).

[YushengLi]

+1 for this, this is the only reason I have to check development log after using rails_panel，a formatted params would be easy for debugging.

[dejan]

Thanks for suggestion! Implemented in #201