[ruby-core:104677] [Ruby master Bug#18044] unusual behavior with Arabic string in a Hash

Issue #18044 has been reported by 0xleaf (0x leaf).

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Bug #18044: unusual behavior with Arabic string in a Hash
https://bugs.ruby-lang.org/issues/18044

* Author: 0xleaf (0x leaf)
* Status: Open
* Priority: Normal
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
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Hey all,

I found a potential bug where looking up a key that contains an arabic string always returns "nil" instead of the string. To reproduce, run the following script

```ruby
foo = {"arabic‎" => "ٱلتَّوْبَة"}
p foo.keys # => ["arabic"]
p foo["arabic"] # => nil
p foo.values_at("arabic") => [nil]
foo.fetch "arabic" # Raises error with - did you mean "arabic" ?
```

Tested on:

* ruby 3.0.1p64 (2021-04-05 revision 0fb782ee38) [x86_64-linux]
* ruby 2.7.3p183 (2021-04-05 revision 6847ee089d) [x86_64-linux]



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