> This tree of strings is then converted to YAML tokens using the class Psych::ScalarScanner that internally uses regular expressions to identify YAML types. I

> This tree of strings is then converted to YAML tokens using the class Psych::ScalarScanner that internally uses regular expressions to identify YAML types. It's there, but I agree it's bad editorializing. A better takeaway is that if you use YAML you will be burned, but even that is a reach since YAML for all its horrors is the best serialization format for Ruby, something for which you'd probably be equally ill-advised to roll your own.