Issue #17608 has been updated by Eregon (Benoit Daloze).


FWIW, this was confirmed as rejected by matz:
https://github.com/ruby/dev-meeting-log/blob/master/DevelopersMeeting20210216Japan.md#feature-17608-compact-and-sum-in-one-step-sawa

----------------------------------------
Feature #17608: Compact and sum in one step
https://bugs.ruby-lang.org/issues/17608#change-90943

* Author: sawa (Tsuyoshi Sawada)
* Status: Rejected
* Priority: Normal
----------------------------------------
Many use cases of `Array#sum` are preceded with the `compact` method or are followed by a block to ensure the value is addable.

```ruby
a = [1, nil, 2, 3]

a.sum # !> TypeError

a.compact.sum # => 6

a.sum{_1 || 0} # => 6
```

I propose there should be a way to do that in one step. I request either of the following:

A. Change the current behaviour to skip `nil`s.

```ruby
a.sum # => 6
```

B. `Array#filter_sum` method

```ruby
a.filter_sum # => 6
```

C. An option for `Array#sum` 

```ruby
a.sum(compact: true) # => 6
```



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