From: "k0kubun (Takashi Kokubun) via ruby-core" <ruby-core@...>
Date: 2025-01-15T02:00:11+00:00
Subject: [ruby-core:120691] [Ruby master Bug#21008] Array#sum, Enumerator#sum, Numeric subclass

Issue #21008 has been updated by k0kubun (Takashi Kokubun).

Backport changed from 3.1: REQUIRED, 3.2: DONE, 3.3: REQUIRED, 3.4: REQUIRED to 3.1: REQUIRED, 3.2: DONE, 3.3: DONE, 3.4: REQUIRED

ruby_3_3 commit:7b9caf19ba480d168ef4c5e93690735240975c91 merged revision(s) commit:b176d4f52e4af67654814dab3e9c5f4bf9170e54.

----------------------------------------
Bug #21008: Array#sum, Enumerator#sum, Numeric subclass
https://bugs.ruby-lang.org/issues/21008#change-111516

* Author: MSP-Greg (Greg L)
* Status: Closed
* ruby -v: ruby 3.5.0dev (2025-01-06T17:07:57Z master a61c16ba42) +PRISM [x86_64-linux]
* Backport: 3.1: REQUIRED, 3.2: DONE, 3.3: DONE, 3.4: REQUIRED
----------------------------------------
The following code seems to show a bug or 'quirk'.  When using a Numeric subclass, `Array#sum` works correctly, but `Enumerator#sum` does not.  They both work fine when using a `Float`.

```ruby
class Length < Numeric
  def initialize(val)
    @val = Float(val)
  end

  def to_f
    @val
  end
end

ary = []

#������������������������������������������������������������������������������������������������������������������������������ Use Length

ary[0] = Length.new  5
ary[1] = Length.new 10
ary[2] = Length.new 20

puts "Length ary  #{ary.sum}"   #=> 35.0

enum = ary.each
puts "Length enum #{enum.sum}"  #=> 20.0

#������������������������������������������������������������������������������������������������������������������������������ Use Float

ary[0] =  5.0
ary[1] = 10.0
ary[2] = 20.0

puts "Float  ary  #{ary.sum}"   #=> 35.0

enum = ary.each
puts "Float  enum #{enum.sum}"  #=> 35.0
```



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