whole_func_string: function merge(obj) {
      for (var i=1; i < arguments.length; i++) {
        var def = arguments[i]
        for (var n in def)
          if (obj[n] === undefined) obj[n] = def[n]
      }
      return obj
    }
func_code_string: function merge(obj) {
      for (var i=1; i < arguments.length; i++) {
        var def = arguments[i]
        for (var n in def)
          if (obj[n] === undefined) obj[n] = def[n]
      }
      return obj
    }
func_documentation_string: Fills in default values.