From: eregontp@...
Date: 2020-12-21T10:37:32+00:00
Subject: [ruby-core:101576] [Ruby master Bug#17409] Endless range of dates stuck on include? when miss

Issue #17409 has been updated by Eregon (Benoit Daloze).


Maybe there should be some `Class#<=>_consistent_with_succ?`/`Class#compare_consistent_with_succ?` method, then we'd be able to use `cover?` semantics for `Range#include?` for all types where it makes sense.

String is a bit special in that it holds for e.g., 'a'...'z' (and Range is optimized for that case), but it doesn't hold for 'z'..'aa'.

----------------------------------------
Bug #17409: Endless range of dates stuck on include? when miss
https://bugs.ruby-lang.org/issues/17409#change-89361

* Author: gsmetal (Sergey G)
* Status: Rejected
* Priority: Normal
* ruby -v: ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
This code stucks (on latest ruby 2.7.1):
```ruby
require 'date'

(Date.today..).include?(Date.today - 1)
```

But it works well with `cover?`:
```ruby
2.7.1 :001 > require 'date'
 => true 
2.7.1 :002 > (Date.today..).cover?(Date.today - 1)
 => false 
```



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