​​Sorbet is 100% compatible with #ruby. It type checks normal method definitions, and introduces backwards-compatible syntax for method signatures: https://sorbet.org/

#ruby on rails 6.0 release: https://weblog.rubyonrails.org/2019/8/15/Rails-6-0-final-release/

Interesting. I thought that ruby is dead...

​​dry-effects is a practical, production-oriented implementation of algebraic effects in #ruby.

https://dry-rb.org/gems/dry-effects/0.1/