You can add understanding of !!perl/regexp [ pattern, isu ] at any time, but backwards compatibility requires making the generation of that an option. Eventually, once support has been established, it could default to the new method.

In reply to Re^3: YAML::XS perl/regexp (?u:(?u: by ikegami
in thread YAML::XS perl/regexp (?u:(?u: by Boldra

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