Issue #22137 has been updated by headius (Charles Nutter). Related discussions in https://bugs.ruby-lang.org/issues/16150 where I proposed a way to request frozen strings from `to_s`. I've always been +1 for all immediate values that return the same string content every time to return frozen strings. This has shown up as a problem in performance profiles of JRuby apps for decades. ---------------------------------------- Feature #22137: Change `Symbol#to_s` to return frozen strings https://bugs.ruby-lang.org/issues/22137#change-117833 * Author: byroot (Jean Boussier) * Status: Open ---------------------------------------- Since Ruby 3.4 ([Feature #20350]) `Symbol#to_s` returns a chilled string, meaning mutating it emits a deprecation warning. I believe it's now time to act on this deprecation, I'd like to request that on Ruby 4.1, `Symbol#to_s` always return a frozen string. Several very large codebases include Shopify and GitHub have been running with `Symbol.alias_method(:to_s, :name)` without any compatibility issues whatsoever. Making this change would allow to progressively get rid of an annoying pattern in performance sensitive code: ```ruby arg.is_a?(Symbol) ? arg.name : arg.to_s ``` -- https://bugs.ruby-lang.org/

Issue #22137 has been updated by nobu (Nobuyoshi Nakada). I'd suggest to rename `STR_CHILLED_LITERAL` as `STR_CHILLED` simply. We shouldn't introduce any more ad-hoc flags such `_TO_S`. ---------------------------------------- Feature #22137: Change `Symbol#to_s` to return frozen strings https://bugs.ruby-lang.org/issues/22137#change-118011 * Author: byroot (Jean Boussier) * Status: Open ---------------------------------------- Since Ruby 3.4 ([Feature #20350]) `Symbol#to_s` returns a chilled string, meaning mutating it emits a deprecation warning. I believe it's now time to act on this deprecation, I'd like to request that on Ruby 4.1, `Symbol#to_s` always return a frozen string. Several very large codebases include Shopify and GitHub have been running with `Symbol.alias_method(:to_s, :name)` without any compatibility issues whatsoever. Making this change would allow to progressively get rid of an annoying pattern in performance sensitive code: ```ruby arg.is_a?(Symbol) ? arg.name : arg.to_s ``` -- https://bugs.ruby-lang.org/