Issue #19526 has been updated by ko1 (Koichi Sasada). Status changed from Open to Closed It was a bug. fixed https://github.com/ruby/ruby/pull/7507 Thank you! ---------------------------------------- Bug #19526: Rails Active Support behavior change since e87d0882910001ef3b0c2ccd43bf00cee8c34a0c https://bugs.ruby-lang.org/issues/19526#change-102409 * Author: yahonda (Yasuo Honda) * Status: Closed * Priority: Normal * ruby -v: ruby 3.3.0dev (2023-03-06T06:03:06Z master e87d088291) [x86_64-linux] * Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- This issue has been opened while investigating Rails issue https://github.com/rails/rails/issues/47627#issuecomment-1464724436 ### Steps to reproduce - Run this script saves as diag47627.rb ``` options = { hello: "world" } def test(opts) = opts puts test(*[], **options).equal?(options) ``` ### Expected behavior It returns `false` as Ruby 3.2.1 and Ruby 3.3.0dev 0463c5806a does ``` $ ruby -v ruby 3.3.0dev (2023-03-06T05:52:46Z master 0463c5806a) [x86_64-linux] $ ruby diag47627.rb false $ ``` ``` $ ruby -v ruby 3.2.1 (2023-02-08 revision 31819e82c8) [x86_64-linux] $ ruby diag47627.rb false ``` ### Actual behavior It returns `true` ``` $ ruby -v ruby 3.3.0dev (2023-03-06T06:03:06Z master e87d088291) [x86_64-linux] $ ruby diag47627.rb true ``` ### Workaround Duplicate the value inside the method that restores the original behavior. - another_diag47627.rb ```ruby options = { hello: "world" } def test(opts) = opts.dup puts test(*[], **options).equal?(options) ``` ``` $ ruby -v ruby 3.3.0dev (2023-03-06T05:52:46Z master 0463c5806a) [x86_64-linux] $ ruby another_diag47627.rb false $ ``` At the Rails side, reverting https://github.com/rails/rails/commit/9e4ff29f748b05c3a949f0d75167950039b6cd... can also workaround it. -- https://bugs.ruby-lang.org/