分享 Matz: I decided not to introduce full refinement for Ruby 2.0
https://bugs.ruby-lang.org/issues/4085#note-175
Since there still remain undefined corner case behavior in refinements, and the time is running out, I decided not to introduce full refinement for Ruby 2.0. The limited Ruby 2.0 refinement spec will be:
- refinements are file scope
- only top-level "using" is available
- no module scope refinement
- no refinement inheritance
- module_eval do not introduce refinement (even for string args)
File scope 应该还算比较靠谱，和.NET 有点类似，可以作为 Open Class 的有效补充。不过确实有点鸡肋。增加程序员的负担，但是可以有效避免 Monkey Patch 的问题。