[pull] master from ruby:master - #1398
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[Feature #22238]
```ruby
"hello".tr("x" => "y") #=> nil (should be "hello")
"hello".tr({}) #=> nil (should be "hello")
s = +"hello"
s.tr!("x" => "y") #=> nil
s #=> "" (the receiver is emptied)
"0123456789abcdefghij".tr("h" => "H", "2" => "@")
```
* Exclude all external libraries that are not built-in. * Exclude CRuby-specific extensions (all encodings, transcoders, and their databases). * Do not remove directory names. * Remove only the `.rb` or `.so` extensions.
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