class KramdownRFC::ParameterSet

def van(pn) # pn is a parameter name, possibly with =aliases

pn is a parameter name, possibly with =aliases
def van(pn)         # pn is a parameter name, possibly with =aliases
  names = pn.to_s.split("=")
  [self[names.reverse.find{|nm| has?(nm)}], names.first]
end