YAML-LibYAML prior to 0.903.0 for Perl uses 2-args open, allowing existing files to be modifiedCredits@shlomif (Shlomi Fish)Referenceshttps://github.com/ingydotnet/yaml-libyaml-pm/issues/120https://github.com/ingydotnet/yaml-libyaml-pm/pull/121https://github.com/ingydotnet/yaml-libyaml-pm/pull/122
