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From: "tenderlovemaking (Aaron Patterson) via ruby-core"
Date: 2025-06-04T19:31:21+00:00
Subject: [ruby-core:122411] [Ruby Bug#21396] Set#initialize should call Set#add on items passed in
Issue #21396 has been reported by tenderlovemaking (Aaron Patterson).
----------------------------------------
Bug #21396: Set#initialize should call Set#add on items passed in
https://bugs.ruby-lang.org/issues/21396
* Author: tenderlovemaking (Aaron Patterson)
* Status: Open
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
----------------------------------------
```ruby
class Foo < Set
def add(item) = super(item.bytesize)
end
x = Foo.new(["foo"])
p x
p x.include?(3)
```
On Ruby 3.4 the output is this:
```
> ruby -v test.rb
ruby 3.4.1 (2024-12-25 revision 48d4efcb85) +PRISM [arm64-darwin24]
#
true
```
On Ruby master the output is this:
```
> make run
./miniruby -I./lib -I. -I.ext/common -r./arm64-darwin24-fake ./test.rb
#
false
```
The bug is that `initialize` is not calling `add` for the elements passed in, so the subclass doesn't get a chance to change them.
I've sent a PR here: https://github.com/ruby/ruby/pull/13518
--
https://bugs.ruby-lang.org/
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