{name, "exp"}.
{jsx, [start_array,start_array,
 {float,"2.0e7"},
 end_array,
 {float,"2.0e7"},
 start_object,
 {key,"key"},
 {float,"2.0e7"},
 {key,"another key"},
 {float,"2.0e7"},
 end_object,
 {float,"4.2e70"},
 end_array,end_json]}.
{json, "exp.json"}.
{jsx_flags, [{comments,true}]}.