Issue #11554 has been reported by Kenichi Kamiya.

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Feature #11554: Privatize {Single}Forwardable API
https://bugs.ruby-lang.org/issues/11554

* Author: Kenichi Kamiya
* Status: Open
* Priority: Normal
* Assignee: 
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For improve consistency with Module#define_method and Module#alias_method.

patch: https://github.com/ruby/ruby/pull/1036



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