[ruby-core:88795] [Ruby trunk Bug#14926] Different results between Enumerable#sum and #reduce when Float::INFINITY present

From: nagachika00@...
Date: 2018-09-01 02:31:35 UTC
List: ruby-core #88795
Issue #14926 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 2.3: DONTNEED, 2.4: DONE, 2.5: REQUIRED to 2.3: DONTNEED, 2.4: DONE, 2.5: DONE

ruby_2_5 r64603 merged revision(s) 64014.

----------------------------------------
Bug #14926: Different results between Enumerable#sum and #reduce when Float::INFINITY present
https://bugs.ruby-lang.org/issues/14926#change-73837

* Author: swistak35 (Rafał Łasocha)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux]
* Backport: 2.3: DONTNEED, 2.4: DONE, 2.5: DONE
----------------------------------------
When `Float::INFINITY` is present in array, `Enumerable#sum` and `Enumerable#reduce(0, &:+)` are giving different results.

```
puts [Float::INFINITY].sum
puts [Float::INFINITY].reduce(0, &:+)
```

results in

```
NaN
Infinity
```

And I would expect both of them to be `Infinity` (meaning: `#sum` is working incorrectly).

Checked on `ruby 2.5.1p57` and `ruby 2.4.3p205`, both have the same bug.



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