[ruby-core:102067] [Ruby master Bug#17537] === on ranges of strings is not consistant with include?

Issue #17537 has been reported by akim (Akim Demaille).

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Bug #17537: === on ranges of strings is not consistant with include?
https://bugs.ruby-lang.org/issues/17537

* Author: akim (Akim Demaille)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-darwin18]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
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Hi,

In Ruby up to 2.6 both `("1".."12").include?("6")` and `("1".."12") ===  "6"` were true.  In 2.7 and 3.0, `include?` accepts `"6"`, but `===` does not.  This was very handy in `case`s.  Reading the documentation it is unclear to me whether this change was intentional.

```
$ cat /tmp/foo.rb
puts(("1".."12").include?("6"))
puts(("1".."12") === "6")
p(("1".."12").to_a)
$ ruby2.6 /tmp/foo.rb
true
true
["1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12"]
$ ruby2.7 /tmp/foo.rb
true
false
["1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12"]
$ ruby3.0 /tmp/foo.rb
true
false
["1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12"]
```

Cheers!



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