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libyaml allows illegal single-quote escape #68
libyaml appears to allow a single-quote escape sequence that is NOT allowed by YAML 1.1+.
From the spec, at http://yaml.org/spec/1.1/#id872840, you can see that double quote is a valid escape but single quote is not.
At this time, neither we nor the YAML library we use (SnakeYAML) plan to support this illegal character. I think it would be best for all YAML consumers if libyaml stuck to the spec here.