I disagree on the safe_yaml point, as the YAML never comes from an untrusted source here.  The security problems around YAML are from untrusted user inputs and being a static site generator with all YAML being presented by the operator, that doesn't seem to me to present a risk.  Is there *value* in the increased functionality?  Negligible, to be sure -- but adding an external dependency to guard against a non-problem seems a touch wasteful, no?