[ruby-core:119158] [Ruby master Bug#20725] Inconsistent handling of doubly-unbounded ranges in Range#overlap?

Issue #20725 has been updated by nobu (Nobuyoshi Nakada).


https://github.com/ruby/ruby/pull/11609

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Bug #20725: Inconsistent handling of doubly-unbounded ranges in Range#overlap?
https://bugs.ruby-lang.org/issues/20725#change-109742

* Author: jeromepl (Jerome Parent-Levesque)
* Status: Open
* ruby -v: ruby 3.3.5 (2024-09-03 revision ef084cc8f4) [arm64-darwin23]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
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The new `Range#overlap?` method does not seem to have a clear definition of how it behaves when passed ranges with nil begin **and** end `(nil..)`.

In the following two cases, it seems to treat this type of range as an "infinite" range that covers the entire space and therefore overlaps with anything:
```
(nil..nil).overlap?(nil..) # => true
(nil..nil).overlap?(3..) # => true
```
However it behaves differently in this case:
```
(nil..nil).overlap?(..3) # => false
```

Note that this also behaves differently than the ActiveSupport implementation of #overlap? in a Ruby version < 3.3 such as 3.2:
```
require "active_support"
(nil..nil).overlap?(..3) # => true
```

I think `(nil..nil)` ranges should always be considered to be completely unbounded, i.e. infinite and covering the whole space. They should therefore always return `true` when overlapping with any non-empty range.



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