From: "matz (Yukihiro Matsumoto)" <noreply@...>
Date: 2022-10-20T04:32:42+00:00
Subject: [ruby-core:110428] [Ruby master Bug#18983] Range#size for beginless Range is not nil.

Issue #18983 has been updated by matz (Yukihiro Matsumoto).


I agree with inconsistency; if edges were numeric, return the count (or Infinity), otherwise it should return nil.
`nil .. nil` can be considered as numeric-range both edge omitted, but at the moment I feel it should return nil as well.
Let us experiment how it works.

Matz.


----------------------------------------
Bug #18983: Range#size for beginless Range is not nil.
https://bugs.ruby-lang.org/issues/18983#change-99738

* Author: masasakano (Masa Sakano)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.1.2p20 (2022-04-12 revision 4491bb740a) [x86_64-darwin20]
* Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN
----------------------------------------
`Range#size` should, according to [Official docs](https://ruby-doc.org/core-3.1.2/Range.html#method-i-size),

> Returns the count of elements in self if both begin and end values are numeric; otherwise, returns nil

but it doesn't with beginless non-Numeric Ranges (in Ruby-3.1.2 or earlier).

```ruby
(..?a).size      # => Infinity
(nil..nil).size  # => Infinity
```

whereas it certainly does with endless Ranges

```ruby
(?a..).size      # => nil
```


---Files--------------------------------
bug-20220829-beginless_range.rb (1.24 KB)
6378.patch (1.37 KB)


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