The Ruby we write is quite strange by the normal reckoning. In particular, it has 100% branch coverage. Being able to do this affordably is one reason I use it.
A fair number of the dependencies we have also have 100% branch coverage, because I copied the practice, starting about ten years ago, from Jeremy Evans, who maintains a huge number of libraries under that principle. That includes "Sequel," the ORM that I've used for many years and originally copied the practice from, around 2015. You can see the libraries he maintains in this way: http://code.jeremyevans.net/ruby.html. He has joined Ubicloud somewhat recently, so I look forward to getting a sense of how he completes the rest of his rather singular & extraordinary maintenance regime.
To have Ubicloud rest at this standard is my objective. My tendentious claim is as follows: this is higher than any other constellation of libraries I have seen in any programming language. If anyone knows of any constellation of libraries that is more capably and rigorously maintained in any language, let me know. The bar as roughly as follows they need to release every month, or something like that (yes really: https://rubygems.org/gems/sequel/versions/), have a wide interface with your program, and break it no more than once every five years.
It's also not a Rails program, and I have never written or maintained a Rails program in any seriousness, which makes me an odd duck among longtime Ruby programmers.