Issue #6018 has been reported by kyo endo.

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Bug #6018: String#[]の説明

https://bugs.ruby-lang.org/issues/6018

Author: kyo endo
Status: Open
Priority: Normal
Assignee: 
Category: 
Target version: 
reporter: 
ruby_version: 


self[nth]の返り値がIntegerになっています(self[nth] -> Integer). 正しくは，「self[nth] -> String | nil」ではないでしょうか.


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