Issue #9798 has been reported by Hiroshi SHIBATA.

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Backport #9798: Backport latest version of Psych
https://bugs.ruby-lang.org/issues/9798

* Author: Hiroshi SHIBATA
* Status: Open
* Priority: Normal
* Assignee: 
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Please backport libyaml-0.1.6 fixes in Psych.

ref. r45221, r45453, r45455 and r45577



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