>> var coderef = function() {return true;}
  undefined

>> typeof coderef
  "function"

>> coderef instanceof Function
  true

>> coderef.toString()
  "function() {return true;}"

>> coderef.toSource()
  "(function() {return true;})"

>> JSON= {a: coderef.toString() }
  {…}
  a: "function() {return true;}"