From: eregontp@... Date: 2020-11-20T12:47:34+00:00 Subject: [ruby-core:100976] [Ruby master Bug#10845] Subclassing String Issue #10845 has been updated by Eregon (Benoit Daloze). @ioquatix See #6087. Returning subclass instances leads to all kind of issues, because there is no good way to build the subclass instance. +1 to do it for String since we did for Array. Maybe we should do it for Hash too? It seems already the case for most Hash methods but not all (e.g. `Hash#merge`). ---------------------------------------- Bug #10845: Subclassing String https://bugs.ruby-lang.org/issues/10845#change-88639 * Author: sawa (Tsuyoshi Sawada) * Status: Open * Priority: Normal * Assignee: matz (Yukihiro Matsumoto) * ruby -v: 2.2 * Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN ---------------------------------------- If I make a subclass of `String`, the method `*` returns an instance of that class. ~~~ruby class MyString < String end MyString.new("foo").*(2).class #=> MyString ~~~ This is different from other similar operations like `+` and `%`, which return a `String` instance. ~~~ruby MyString.new("foo").+("bar").class #=> String MyString.new("%{foo}").%(foo: "bar").class #=> String ~~~ I don't see clear reason why `*` is to be different from `+` and `%`, and thought that perhaps either the behaviour with `*` is a bug, or the behaviour with `+` and `%` is a bug. Or, is a reason why they are different? -- https://bugs.ruby-lang.org/ Unsubscribe: