Issue #9668 has been reported by Tomoyuki Chikanaga.

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Backport #9668: Backport r45393 (Fix up default GC params)
https://bugs.ruby-lang.org/issues/9668

* Author: Tomoyuki Chikanaga
* Status: Open
* Priority: Normal
* Assignee: 
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Please backport r45393.
See https://github.com/ruby/ruby/pull/556



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