what i want:
[ txt, [ txt, txt ], key-val, btn, radio(m/f) ]

bandwidth-saving
["hello",["",["hi","bye"]],["x",7],["Click Me"],["choose",[["m"],["f"]],{"select":1}]]

more human-readable?
["hello",["hi","bye"],{"#":"x","=":7},{"opt":"Click Me"},{"#":"choose","=":[{"opt":"m"},{"opt":"f"}],"select":1}]