[ruby-core:113010] [Ruby master Bug#18748] Range#cover? returns true for beginless range of different type

Issue #18748 has been updated by nagachika (Tomoyuki Chikanaga).

Backport changed from 2.7: REQUIRED, 3.0: REQUIRED, 3.1: REQUIRED to 2.7: REQUIRED, 3.0: REQUIRED, 3.1: DONE

ruby_3_1 477ab3f6c7f14c79e13f694463aa06a59206dda1 merged revision(s) c5475f42694eff35465c3332e0182c0611ca5918.

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Bug #18748: Range#cover? returns true for beginless range of different type
https://bugs.ruby-lang.org/issues/18748#change-102544

* Author: jeremyevans0 (Jeremy Evans)
* Status: Closed
* Priority: Normal
* Backport: 2.7: REQUIRED, 3.0: REQUIRED, 3.1: DONE
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While adding documentation to address #18155, I found a bug:

```ruby
(2..).cover?("2"..) # => false
(..2).cover?(.."2") # => true
```

I've submitted a pull request for fix this: https://github.com/ruby/ruby/pull/5831



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