test error handling in child task (now failed)
prevent try catch, maybe performance better. and , now buggy
reduce 1 try catch because now .execute is safe
add .track() to sync error between subtasks or mutated tasks
add more test. later check for the hash subtask + error handling
fix ender logic bug when hashed subtask is sync
remove debug. now still 1 error
now can handle error in subtasks correctly , also support task.quiet()
add more doc about error handling