$ ./jo foo=1 bar=2 obj=$(./jo -a 1 2 3 "</script" '"')
  {"foo":1,"obj":[1,2,3,"<\/script","\""],"bar":2}

  $ ./jo foo='abc
  > def
  > ghi'
  {"foo":"abc\ndef\nghi"}

  $ cat jo
  #!/usr/local/bin/txr --lisp
  
  (define-option-struct jo-opts nil
    (a   array   :bool
         "Produce array instead of object")
    (nil help    :bool
         "Print this help"))
  
  (defvarl jo-name *load-path*)
  
  (defun json-val (str)
    (match-case str
      ("true" t)
      ("false" nil)
      ("null" 'null)
      (`{@nil` (get-json str))
      (`[@nil` (get-json str))
      (@else (iflet ((num (tofloat else)))
               num
               else))))
  
  (let ((o (new jo-opts)))
    o.(getopts *args*)
    (when o.help
      (put-line "Usage:\n")
      (put-line `  @{jo-name} [options] arg*`)
      o.(opthelp)
      (exit 0))
  
    (if o.array
      (let ((items [mapcar json-val o.out-args]))
        (put-jsonl (vec-list items)))
      (let ((pairs [mapcar (lambda (:match)
                             ((`@this=@that`) (list (json-val this) (json-val that)))
                             ((@else) (error "~a: arguments must be name=obj pairs" jo-name)))
                           o.out-args]))
        (put-jsonl ^#H(() ,*pairs)))))