[ruby-core:118587] [Ruby master Bug#20307] `Hash#update` from compare_by_identity hash can have unfrozen string keys

["nagachika (Tomoyuki Chikanaga) via ruby-core" <ruby-core@ml.ruby-lang.org>]

Issue #20307 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 3.0: REQUIRED, 3.1: REQUIRED, 3.2: REQUIRED, 3.3: DONE to 3.0: REQUIRED, 3.1: REQUIRED, 3.2: DONE, 3.3: DONE

ruby_3_2 commit:90a44bcd39c569d851f73d167955c83f3ff2384f merged revision(s) commit:f36a71e26995b69ff72bc132bbcf40ad89571414.

----------------------------------------
Bug #20307: `Hash#update` from compare_by_identity hash can have unfrozen string keys
https://bugs.ruby-lang.org/issues/20307#change-109112

* Author: nobu (Nobuyoshi Nakada)
* Status: Closed
* Backport: 3.0: REQUIRED, 3.1: REQUIRED, 3.2: DONE, 3.3: DONE
----------------------------------------
I don't think this behavior is expected.

```ruby
i = Hash.new.compare_by_identity
k = "a"
i[k] = 0
h = {}.update(i)
p h.compare_by_identity?  # => false
p h["a"]                  # => 0

k.upcase!
# `k` is still in `h`.
p h.keys.include?(k)      # => true

# but not found.
p((h.fetch(k) rescue $!)) # => #<KeyError: key not found: "A">
h["A"] = 1  
p h                       # => {"A"=>0, "A"=>1}
```

I expect `h` to still have `"a"=>0` entry.




-- 
https://bugs.ruby-lang.org/
 ______________________________________________
 ruby-core mailing list -- ruby-core@ml.ruby-lang.org
 To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org
 ruby-core info -- https://ml.ruby-lang.org/mailman3/lists/ruby-core.ml.ruby-lang.org/