String/Symbol consistency

[saty9]

Currently Enums use strings both for unit enums and newtype enums but structs use symbols this leads to odd looking ruby hashes with mixes of hash rocket and symbol syntax.

Could everything use either strings or symbols. My personal preference is symbols as I think the notation is cleaner. Alternatively could the behaviour be changed using features.

Happy to do the work for this and submit a PR but would like to know there is appetite for this before getting started.

[saty9]

Apologies for spam I'm on a train and went through a dead patch and got a little refresh button happy

[ianmurrays]

I'm also interested in this