Cycle data structure exposing mutable and (coming soon!) immutable APIs.

Some example usages: [here](https://cs.tvl.fyi/search?q=context:global+repo:%5Edepot%24+lang:%22Emacs+Lisp%22+%22%28require+%27cycle%29%22&patternType=regexp)

What does the package do?

Defines a cycle data structure and functions for interacting with it. For example I use it to manage vterm instances in Emacs: [here](https://cs.tvl.fyi/depot/-/blob/users/wpcarro/emacs/pkgs/vterm-mgt/vterm-mgt.el?L41), [here](https://cs.tvl.fyi/depot/-/blob/users/wpcarro/emacs/pkgs/vterm-mgt/vterm-mgt.el?L58-59), (etc)

Did you consider using a ring to do these things?

Thanks for pointing this out! I could implement this with ring. I wanted a mutable and immutable interface with arguments ordered in a way that works well with dash’s ->> macro

Nice one!

Thanks :)