class KramdownRFC::ParameterSet

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

pn is a parameter name, possibly with an =alias 
def van(pn)                   # pn is a parameter name, possibly with an =alias
  an, pn = pn.to_s.split("=")
  pn ||= an
  [self[pn] || self[an], an]
end